Prime (KS3) Core Kit

The Prime (KS3) Core Kewlus Kit is perfect for those looking to make their own custom base (or screw it down to the floor) for optimum performance.

Kit Suitability

This kit is best suited for those who would like to get maximum performance from the cobra bag by making a DIY base or screwing the Base Connector to the floor.

ATTENTION: It is critical to assemble the ball & adapter correctly. Please ensure you read the instructions fully before use. Failure to assemble correctly may void your warranty.

What's Included:

• The Prime (KS3) Spring: Third generation spring made from the unique formulation of metals for the ultimate performance and longevity. No other spring comes even close.
• Genuine Leather Prime Target Ball: Genuine leather target ball designed for ultimate performance and durability. It's the perfect balance between speed and power.
• Target Ball Adapter: Extendable length for increased reach, designed and engineered to allow flexibility at the rim for cupping the ball while maintaining top section rigidity and rebound speed. The Adapter and Kewlus targets have been designed in unison to fit perfectly together for optimum performance.
• 2 x Click Bars: Lightweight, rust-free aluminium bars which can be used in both the bottom section (below the spring) for overall height adjustment and top section (above the spring) for adjusting the range of movement of the bag.
• Alloy Mast: Made for the general use from lightweight alloy that will not rust.
• Base Connector: Versatile base connector made from composite fibre for the ultimate strength and rigidity is unlike most of the common water filled based where rigidity is lost due to the non-fibre plastic that is used.
• Pair of Sandbags: The two bags add 90 pounds of weight when filled with sand.

Custom Base DIY:

The Core Kit does NOT include any base, giving you the option to make your own heavy duty, custom base. The best and easiest way to make a base is to simply glue together two or more 2ft x 2ft MDF boards. Usually one MDF board is not thick enough, so gluing together multiple boards provides the thickness needed for using long screws. I recommend a thickness of at least 1.5 inches, but with more boards glued together you will also gain an advantage of extra height as well as extra weight. Check out the following page with instructions and a video on how to make a suitable DIY base:

https://kewlus.com/blogs/diy/how-to-make-baseboard-cobra-bag

The recommended minimum weight for the base is 90 pounds (one pair of Sandbags), however adding a second pair of sandbags on top or an Olympic Sleeve with a weight plate will improve performance.

Height Range:

The height range of the cobra bag is roughly 4'8" (143 cm) to 5'7" (171 cm) from the floor to the top of the bag. This can be increased to suit taller fighters by making the base taller (gluing together more boards in the making of the base).

Convertible to Short Form:

The KS3 Cobra Bag can be converted to a shortened form, making the height range roughly 3'3" (100 cm) to 3'7" (110 cm). This form is ideal for smaller children or for mounting upside-down from the ceiling or horizontally on a wall.

Optional Add-Ons:

• Additional Pair of Kewlus Sandbags: For extra weight and improved performance.
• Olympic Weight Plate Sleeve: Allows the use of one or two Olympic weight plates for added stability.
• Red Bar: Increases the speed of the cobra bag.
• Cobra Bag Replacement Bladder: Backup replacement bladder for future use.

Product Features:

• High Performance: Engineered for speed, power, and durability.
• Modular Design: Customizable components for a tailored training experience.
• Used by Champions: Trusted by world champion boxers for elite training.

For any queries or assistance, visit the Customer Support page. Additionally, Reedy's AI Assistant is available in the bottom right corner of the website to answer almost all questions. If he can't answer a question, you can contact me via the Contact page.

Caring for the Environment through Sustainable Design

All Kewlus gear is built around a modular system — every part is designed to be replaceable. If something breaks or wears out, you simply swap out the component instead of tossing the entire unit. I'll even send you a 50% discount code if you send me a picture of the broken part - that's my commitment for life! This approach drastically reduces waste and extends the life of your gear, making it a smarter, more sustainable way to train.

The Core kit takes this a step further by allowing you to make your own solid wood base or screw it down to your floor. This is unlike other cobra bags that come with massive plastic bases, which eventually crack and end up in landfill or in our waterways and oceans as microplastics. By investing in Kewlus, you're helping to care for the environment.