Prime (KS3) Core Kit (No Base)
Prime (KS3) Core Kit (No Base)
All duties and tariffs pre-paid. No extra charges at delivery.
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The Prime (KS3) Core Kit combines the fast, responsive rebound of the KS3 Prime Spring with a no-base setup designed for maximum performance from a solid DIY base. It is an excellent choice for anyone who wants a premium cobra bag while keeping the overall cost down by making their own base or securely mounting the bag to a suitable solid surface.
Who This Kit Is For
This kit is ideal for anyone who wants the high-performance rebound of the KS3 Prime Spring and is comfortable making a simple timber-board base. A solid DIY base can provide excellent rigidity while costing considerably less than a complete freestanding platform.
The Base Connector can also be permanently secured to a suitable solid floor or structural surface for an extremely rigid setup.
Please note: This Core Kit does not include Platform Paddles. A solid DIY base or secure mounting surface is required. The included sandbags are designed to weigh down a DIY board base and improve stability during training.
Make Your Own Solid DIY Base
The recommended setup is a solid DIY base made by gluing multiple layers of MDF board or particle board together, then securely mounting the Base Connector onto the top. This creates an extremely sturdy and affordable base that can be customised to suit your preferred height.
The included Kewlus Sandbags can then be placed around the mast to add weight and stability. You can also attach castor wheels to the back of your DIY base, making it much easier to move the cobra bag when needed.
Follow my step-by-step DIY base guide for the recommended materials, videos and latest design improvements.
Suitable for Small Children
The KS3 Core Kit can also be converted into a shorter setup for small children. Simply remove the Mast and Click Bar, insert the Prime (KS3) Spring directly into the Base Connector and tighten the steel clamp around the Base Connector collar to secure the spring firmly in place.
This creates a compact version of the cobra bag at a comfortable height for younger users. As they grow, the Mast and Click Bar can be added gradually to increase the height.
Adult supervision: An adult should always assemble the bag and supervise children during use.
What’s Included
- Prime (KS3) Spring : Third-generation spring made from Kewlus Signature Metal Technology for outstanding rebound performance and longevity.
- Genuine Leather Prime Target Ball : Premium leather target ball designed to provide an ideal balance of speed, power and durability.
- Target Ball Adapter : Extendable adapter designed to hold the target ball securely while maintaining top-section rigidity and fast rebound performance.
- 2 × Click Bars : Lightweight, rust-free aluminium bars used for overall height adjustment and control of the bag’s range of movement.
- Alloy Mast : Lightweight, rust-free aluminium mast designed for general home training use.
- Base Connector : Rigid composite-fibre connector designed to secure the mast firmly to your DIY base. Includes the stainless-steel collar clamp used to lock the mast into place.
- Pair of Kewlus Sandbags : Designed to add weight and stability when placed around the mast on your DIY base.
DIY Base, Setup & Performance Tips
For the best stability, make a DIY base that is at least 3 inches thick. Use multiple layers of MDF board or particle board and secure the Base Connector firmly using screws or bolts that are appropriate for the thickness and construction of your base.
Fill the included sandbags completely to the top. Wet sand is ideal because it provides greater weight and stability. Use a heavy-duty plastic bag as a liner inside each sandbag.
Ideally, the top of the target ball should sit at around chin height when you are standing upright in front of the bag. The mast and lower Click Bar allow you to adjust the overall height. Taller users can also glue additional layers onto the DIY base to add extra height.
A taller base allows you to use a shorter top section while maintaining a comfortable target height. This increases the speed and responsiveness of the rebound.
For additional weight and improved performance, consider adding an optional second pair of Kewlus Sandbags .
The optional Olympic Weight Plate Sleeve allows you to place one or two of your own Olympic weight plates above the sandbags. This increases the rigidity of the mast and improves rebound performance.
For a faster and more intense rebound, the top Click Bar can be replaced with the optional Polymer Red Bar . Its shorter and lighter design reduces the length and weight of the top section.
For a ready-made freestanding base, consider the Prime (KS3) Freestanding Kit . For maximum rigidity and additional height, consider the O3 Kit with its OctaBase.
Because this Core Kit does not rely on a large moulded plastic base, it also offers a more sustainable long-term setup. Every major Kewlus component can be replaced individually if it eventually wears out, so your cobra bag can continue evolving with your training rather than being discarded and replaced.
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Shipping & Delivery
Shipping & Delivery
Shipping is calculated at checkout based on total weight and price, with some periodic discounts. Currently there is free shipping on orders over $200 USD.
USA & Canada
Orders for the United States and Canada are typically shipped from our North American warehouse in Canada, with most deliveries arriving within 2–5 business days.
If an item is temporarily out of stock in North America, it may be shipped directly from our international warehouse. In that case delivery usually takes around 1–2 weeks, depending on location.
Please note that an adult signature is required for delivery of cobra bag kits. The courier will NOT be able to leave the package unattended.
International Orders
Orders outside the USA and Canada are shipped from our international warehouse and typically arrive within 1–2 weeks, depending on destination.
All duties and taxes are pre-paid, so there are no additional fees upon delivery.
Multiple Shipments
Because we operate multiple warehouses to keep delivery times fast, some orders may arrive in separate packages if items ship from different locations.
Tracking
You will receive an email with a tracking link as soon as your order is shipped. Orders are not shipped on weekends or public holidays.
Pre-Ordering Products
Some products may be available for pre-order. If you place an order containing both in-stock and pre-order items, the entire order will ship once all items are available.
The KS3 spring is just so incredible fast and has a really great rebound while still not missing out on reach, so it's perfect to work on my Philly shell.
The fact that the whole bag is modular makes it even better. I'm pretty tall, so I might replace the lower click mast with a galvanised pipe to use the shortest/fastest setting of the bag.
It's just a quality product and you can't anything better for this price, plus the customer service by Reedy is top notch.
Don't hesitate and go for it.
Good quality.
Much fun to use.
Nice guy behind the product.
I’ve wanted a reflex bag for years and was finally about to pull the trigger between a grodex or a fierce reflex bag.. Happened to stumble across Kewlus and saw that this new version dropped a few weeks ago. For half the price, this does EXACTLY what the more expensive ones do.. and the quality is THERE.
big respect to ya kewlus !
The KS3 core kit was a present from my missus!
Really impressed with the construction and ease of set up.
The spring is fast and it's a fun and challenging workout.
Very very happy.
Shipping was only 7 days and that was to the UK.
good price and worth every penny.
I'm a professional boxing coach and although this is for my own use at home, I'll definitely be taking it to the gym as well so my boxers can have a go!
Easy to set up and definitely one of the best reflex bags on the market. I had my base drilled to my garage floor, so all I do is remove the pole when I want to park my car.
I had been shopping around for a decent cobra bag and stumbled across the KS3. The quality is fantastic and the spring gives a higher end challenge than any other pieces of equipment in the same price range.