The TheraBand Hand Xtrainer is truly a cross functional device - with applications ranging from rehab to stretching and strength training. It supports a variety of finger, hand, wrist, and forearm exercises, making it an ideal replacement to putty and an economical alternative to hand extensors. TheraBand Hand Xtrainer is an innovative product that offers several key benefits: Patented formula supports hot / cold therapy, ease of use and optimal form. Economical and intuitive; ideal for home exercise Progressive for clear measure of progress. Supports broader range of exercises. Clean and professional. Available in 4 levels of resistance.