Cando Wate Ball
These color coded weight balls are small and flexible enough to grasp with one hand, yet still big enough to hold with two hands. Use a bicycle pump to inflate/deflate to make ball harder/easier to grasp. They're available in 6 weights from 1.1lbs through 6.6 lbs, all maintaining a constant 5" diameter.
Tan - 1.1lb
Yellow - 2.2 lb
Red - 3.3 lb
Green - 4.4 lb
Blue - 5.5 lb
Black - 6.6 lb
Cando Wate Ball