- The Theraflex Putty™ strengthens weakened grasp through exercise and is used for rehabilitative exercise or stress relief. It is odorless, does not stain and will not leave any residue on patient’s hands. Theraflex Putty™ is non-toxic, greaseless, hypo-allergenic and latex-free. The Theraflex Putty™ is available in 5 colors/resistances and comes prepacked. Theraflex Putty™ now has an added anti-microbial component.