Onyx Adjustable Water-Filled Medicine Ball One Ball. Every Weight From 3kg to 20.5kg. A full slam ball progression costs hundreds of dollars and a rack to store it. This is the alternative: one ball whose weight you set with a tap. Empty it's 3kg for warm-ups, beginners and rehab; fully filled it's a 20.5kg heavy ball for serious strength work - and every weight in between is just a fill level. One tool, every user in the gym, one spot on the floor. The water does something a fixed ball can't, too: it shifts as you move. Every slam, throw, twist and carry has live, moving resistance inside it, forcing your core and stabilisers to fight the slosh - the same principle behind unstable-load training used in athletic conditioning. The unique 122-sided textured surface keeps grip locked in through sweaty, high-intensity rounds, and the non-bounce design is engineered for slams, wall balls and functional drills. Key Features Adjustable weight: 3kg empty to 20.5kg full - set it by fill level, change it in a minute Shifting-water resistance - live instability that works stabilisers a fixed ball never touches 122-sided ergonomic texture - sweat-proof, anti-slip grip for confident slams and throws Non-bounce design - built for slams, wall balls, throws, twists and presses Replaces a whole rack - beginner to advanced progressions in one ball Ideal for HIIT, CrossFit, core work, rehab and group classes Specification Details Empty Weight 3kg Maximum Filled Weight 20.5kg (approx. 45lb) Weight Adjustment Water fill level - fully variable Surface 122-sided ergonomic anti-slip texture Behaviour Non-bounce (dead ball style) Use Types Slams, throws, twists, wall balls, presses, carries, core Training Levels Beginner to advanced - one ball covers all Warranty 12 Months Frequently Asked Questions (FAQs) Q: How does it compare to a normal slam ball?A: A fixed slam ball is one weight forever - to progress, you buy another ball. This adjusts from 3kg to 20.5kg with water, and the shifting fill adds a stabiliser challenge fixed balls can't replicate. One ball does the work of a full progression rack. Q: How do I change the weight?A: Add or drain water through the fill port - a minute at any tap. Part-filled weights feel the most "alive" as the water moves; fully filled it behaves closest to a solid heavy ball. Q: Is it suitable for slams?A: Yes - the durable shell and non-bounce design are made for slam work on gym flooring. Like any dead ball, slam onto rubber flooring rather than bare concrete for the longest life. Q: Who is it for?A: Everyone from rehab patients (light fills) to advanced athletes (full weight) - which is exactly why PTs, group-class studios and home gyms love it: one ball serves every client. Backed by Fitness Hero Sydney Stocked at our Sydney warehouse with local warranty support - and you can see the range in person at our Bankstown Megastore. Shop More: Gym Accessories Complete Your Setup: Onyx Aqua Punching Bags | Boxing Equipment Browse Full Range: Commercial Gym Equipment 3 to 20.5 kilos from one tap - the last medicine ball you'll need to buy.
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