Made in the USA and designed for strengthening the muscles of the hands and forarms, Humactive hand putty is available in 8 color-coded resistance levels ranging from X-Soft for the weakest of hands, all the way up through “ULTIMATE” – the highest resistance level on the market. Humactive putties are non-scented and utilize dyes that do not bleed colors, unlike other putty on the market that can stain hands and surfaces. Physical and occupational therapists, golfers, tennis players, marksman, muscians including guitar players, weight lifters, and the elderly are just a few of the groups that use Humactive putty. Our putty is suited for those looking to build strength, slow grip-strength loss related to aging, looking for relief from arthritis pain associated with repetitive motion injury, for carpal tunnel pain, or those recovering from surgery. Also useful for sensory therapy, as a tool for ADD and ADHD sufferers, and for stress relief. Choose from 2 oz, 3 oz, 4 oz, 16 oz, and 80 oz (clinical) sizes. Humactive brand putty colors do not bleed and maintain resistance use after use.