Red - Soft (3 oz.) TheraPutty is the standard in resistive hand exercise material. Each color-coded putty has a different consistency, ranging from xx-soft for weakest grasp, to x-firm for developing a strong grip. Playing with putty is a natural exercise for students with ADD, ADHD and Autism. TheraPutty material is gluten, latex and casein free and is guaranteed to maintain resistance consistency for 1 year.