Theraband Hand Exercisers Are Specially Formulated Exercisers Provided In A Progressive Sequence Of Five Translucent Colors And In Two Sizes *they're Used For Hand Finger And Forearm Strengthening As Well As Hot And Cold Therapy *progressive Resistance In Different Levels Of Compression Allow Each Exercise To Be Geared To The Patient *use The Standard Size Hand Exerciser For Smaller Hands And The Extra Large Size For Larger Hands Or For People Who Have Limited Hand Mobility *place A Hand Exerciser Into The Microwave Or Refrigerator For Hot Or Cold Use *lbs Of Force At 50% Compression: 17 Lbs *black Xl