Cando gel hand exercise ball, large cylindrical, blue, firm cando gel squeeze ball hand exerciser for grip strength, dexterity, mobility, and fine and gross motor skills. Heat or chill for use in hot or cold therapy. Available in 6 color-coded resistance levels. Each level (firmness) available in circular or egg shape. Balls can withstand temperatures ranging from -76f to 167f. Large cylindrical – blue – heavy.