Kewlus Prime (KS3)
Kewlus Prime (KS3)
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The third generation Kewlus Cobra Bag Spring (KS3), which I have named "Prime", is the first of it's kind in the world to be made from a specially formulated metal. Now tested and proven to perform and last for years in numerous boxing gyms around the globe, it is engineered to outperform and outlast every other type of spring. Due to the proven performance and reliability over the last two years it is the spring that comes with all of the KS3 and O3 kits.
Signature Metal Technology
All KS3 springs are engineered from a unique formula metal that achieves the perfect balance between flexibility and springiness. This proprietary alloy delivers exceptional rebound performance and extreme longevity, ensuring consistent, high-quality training every time. Moreover, its remarkable adaptability allows you to easily adjust the spring -whether by bending or straightening (fully assembled) to achieve your desired angle or to correct any slight deviation. This means that even if the spring develops a minor bend over time, you can restore it to perfect alignment, maintaining peak performance under all conditions.
Versatile Configuration Options
The KS3 is designed with flexibility in mind. Its innovative connectors not only allow you to make minor height adjustments at either end, but also convert the cobra bag into a shorter version by plugging it directly into the Base Connector. This adaptability makes the Kewlus accessible for young athletes as early as age five. Additionally, you can mount the short version upside-down to create the ultimate slip bag or install it horizontally on a wall - ideal for practicing uppercuts and hooks. These dynamic configuration options empower you to tailor your training environment to meet diverse needs and skill levels.
Please note that trying to adapt the Kewlus Spring to another cobra bag of a different brand is unlikely to work due to important parameters such as the spring connector diameter, as well as the length and weight of the top section of the bag. Heavy top section bags will result in slow performance.
Important: Setup & Maintenance
Before using the KS3 Spring, please read the KS3 Spring Maintenance Guide.
Please note that the red connectors at the ends of the spring are screwed in and secured with a type of adhesive seal. If for any reason the adhesive seal is broken, please apply epoxy glue to the thread of the connector and screw it back in, leaving in for 24 hours to seal. Here's a link to the type of clear epoxy glue that is suitable for this: https://amzn.to/3B2tGVu
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Shipping Info
Shipping Info
USA & Canada
USA and Canadian orders will be shipped from Canada and takes just 2-3 days to most locations. Shipping is calculated at checkout.
Limited Time Special Offer for USA customers: Orders to USA & Canada over $100 USD get free shipping.
Australia & NZ
Australian orders will be shipped from Queensland and takes just 3-5 days. NZ orders take 7-14 days. Shipping is calculated at checkout based on weight.
The Rest of The World
All of the orders for the rest of the world are shipped from Canada and takes around 1 week to deliver. Shipping is calculated at checkout based on weight.
Please note that you may need to pay import tax in some countries outside of Canada, USA, Australia and New Zealand. Please check with your country's importation laws to find out how much tax would be charged.
Tracking
You will receive an email with a tracking link as soon as your order is shipped from the warehouse. Please note that orders are not shipped on weekends or public holidays.
Pre-Ordering Products
Some products are available to pre-order and receive as soon as the are in stock. Please note that if you order these items together with other products, you whole order will not be shipped until every item in your order is available. All items in your order will be shipped together at the same time.


Love it. The KS3 spring makes the bag faster, easier to adjust height and overall more fun to hit.
Kewlus Cobra Bag Spring (KS3)
I ordered the Kewlus Cobra Bag Spring (KS3) as soon as it came out. Upgraded from the KS2 and man is it a huge upgrade! Since then I have put hundreds of rounds on the cobra bag and it has held up perfect! one thing I did notice was the stability of the mast click bar a little wobbly. Luckily I followed Reedy's YouTube video and built a second deck. I put some Olympic weights on top of my sand bags then I wrapped some duct tape around the click mast to lock it into the Olympic weights and it is a huge improvement to the stability! The second deck was all it needed it works perfect! If yall wanna know how its done look at Reedy's YouTube page he posts a lot of updates on there and upgrades for the cobra bag kit! Hopefully this review helps!
5 stars!
In my opinion she makes more noise than the KS 2 because she is not rubber mounted, but the quality is high end. Very fast and staddy. But i wish for me the cobra bag a little higher for a longer range , you can make it smaler but not much higher. I am 183 cm in height.
Best regards and Greetings from Germany.
Dirk
Hi Dirk, thank you for 5-star review! One thing I would recommend to increase the height is to add an extra layer or two to the baseboard - this will give you an inch or so extra height, plus it will make the base heavier and thus more rigid. The thicker the baseboard, the taller the overall height of the bag will be and the sturdier it will become.
K3 is better than the K2 spring. Happy overall.