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Features of the Cando Ply-A-Ball Memory Foam Grip Ball: Color coded hand exercise sqeeuze balls offer 3 different resisance levels. Memory foam balls are perfect for the early stages of hand therapy. These balls are pliable and workable just like putty...without the mess! Yellow - 1" diameter - Extra Easy
Red - 1.5" diameter - Easy
Green - 2" diameter - Medium
Medex SKU: FAB-10-0778