Power Web Hand Exerciser Unique, patented design allows duplication of virtually all joint actions comfortably and effectively, including flexion, extension, opposition, abduction, adduction, pronation and supination Resistance of each web can be modified to meet specific needs by adjusting hand position and/or depth of finger insertion Both hands can be exercised at once, or a single finger isolated and exercised Constructed of high-quality rubber with special agents added for durability and strength designed to strengthen and condition muscles and joints of finger, wrist and forearm