CanDo® ErgoGrip Hand Exerciser is sold in pairs. Weight equals the amount of force needed to fully compress the fixed ErgoGrip handles. The new CanDo® resistance sequence on these ergonomic grips covers any needs from the earliest stages of rehabilitation after stroke (yellow) to advanced athletic training (black). The force equivalent doubles with each level so you can work your way up. CanDo® Ergonomic Hand Grip Pair - Blue heavy - 24 lb