What is Cando Theraputty Hand Exercise Dough? Cando Theraputty Hand Exercise Dough is a resistant hand exercise material used to strengthen hand muscles. Each color-coded paste comes in different consistencies, from xx-soft to strengthen the weakest grip to extra-firm to enhance the strongest grip. It is in a 56 gram box for individual use. Who Can Use Cando Theraputty Hand Exercise Dough? It is used for the development of children who have fine motor muscle weakness, writing disorders, cannot hold a pencil correctly or cannot draw lines. Cando® Theraputty™ 1- Skin Color (Very Soft) 2- Yellow (Soft) 3- Red (Soft-Medium) 4- Green (Medium-Firm) 5- Blue (Firm) 6- Black (Very-Firm)