TheraBand Hand Xtrainer, Non-Latex Hand Exerciser for Progressive Hand Therapy, Strengthen Fingers, Hands and Forearms, Grip Trainer, Strengthener, Helps Relieve Joint Pain, Black, Heavy, Advanced Ultimate tool for progressive hand therapy in four densities, perfect for home hand exercise or clinic use Safely supports hot and cold therapy in refrigerator or microwave for use at temperature most comfortable and appropriate for the hand Ideal putty replacement supports a variety of finger, hand, wrist and forearm exercises with applications ranging from rehab and stretching to strength training Economical, intuitive, easy to clean and portable for use in the clinic, on the road, in the office or at home Wash with soap and water, if needed, dusty lightly with corn starch or baby powder to reduce stickiness