The SPRI® Ultraball™ has superior performance and maximum durability which help make it the safest and most reliable stability ball on the market today. It's made of a heavier, thicker-gauge material than other balls, so it's more resistant 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 anti-burst technology up to 600 lbs. Choose between 55cm or 65cm. Includes a free downloadable exercise guide. Does not include an inflation pump.

SPRI® Ultraball™ Features:

Superior performance and maximum durability
Safest and most reliable stability ball on the market today
Thicker-gauge material
Resistant to stretching and deforming
Ideal for the most demanding club environments
Dimpled surface for extra traction
Slow-deflate up to 600 lbs.
Downloadable exercise guide