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