SPRI UltraBall Stability Ball - 55cm
The UltraBall's superior performance and maximum durability make it the safest and most reliable stability ball on the market. It's made of heavier, thicker gauge material than other balls, so it's more resistance to stretching or deforming and ideal for use in the most demanding club environments. The dimpled surface offers a 360 degree body-traction effect. Slow deflate up to 600lbs.