Bleed proof, nontoxic, clean and non-oily, Sammons Preston® Therapy Putty leaves no residue and won’t fragment, separate, stain or stick to skin. Six distinct colors reflect established standards in resistive exercise: progress from super soft tan to extra firm gray. Putty can be squeezed, stretched, twisted or pinched to meet a wide range of strengthening needs, or used to encourage heel strike and strengthen foot muscles. Combine colors to create custom resistance to meet individual needs. Nontoxic. Latex free.