Pellor Wrist Roller Exerciser Trainer Forearm Strength Exerciser It can help to improve your performance in any activity quickly that requires grip strength and the use of your hands and wrists. Note: The hanging weight should not be more than 20 pounds. Size: 39 cm tube length,100 cm rope length. Material: steel pipe + foam + nylon rope. Usage: Stand, hold the roller with hand, exert yourself to roll up the heavy hanging objects, restore with controll. First frontal roll then back roll, repeatedly operate. Weight plates are not includes in this product.