Product Description: Power Web Hand Exerciser, One, Standard, Blue, Super Heavy Resistance. POWER-WEB - Level 4 - Blue Resistance LEVEL 4 (Blue) For sports strengthening for all major sports- for those that want to build real strength, very popular for pro sports training. The #1 Finger, Hand, Wrist, and Forearm Exerciser; the Power-Web! Fun to use and great for therapy, training, rehabilitation, injury prevention, and other exercises, the Power-Web comes in three variations with multiple resistance levels. The original Power-Web is 14" in diameter and comes in six different resistances. This listing is for Blue standard superheavy resistance. All Power Web products come with a 90 day guarantee and an exercise manual featuring 39 unique exercises for the Power-Web Resistance of each web meets specific needs by adjusting hand position and/or depth of finger insertion. Exercise coupled with proper resistance allows for full range of motion Allows duplication of virtually all joint actions including flexion, extension, opposition, abduction, adduction, pronation, and supination Both hands can be exercised at once, or a single finger isolated and exercised Check with your clinician for the proper level of resistance for you therapy.