Features. CanDo Theraputty hand exercise material is the standard in resistive hand exercise material. Each color-coded putty has a different consistency ranging from xx-soft for strengthening the weakest grasp to extra-firm for developing a stronger grip. CanDo Theraputty material is gluten latex and casein free. Color - Tan. Size - XX-Soft. Dimension - 4.5 x 1.5 x 4.5 in.