Bopstyle 24KN Heavy Duty Outdoor Climbing Cable Trolley Zip Line Fast Speed Pulley Color: Red - Material: Aviation aluminum. Shape: Fashion heart-shaped design. Length:106mm/4.2", Width: 88mm/3.5", Thickness: 28mm/1.1", Weight:300G Mounted with ball bearing, the double sheaves of pulley provides great smooth rotation and efficient performance.Heavy duty 7075 Aviation aluminum constructed, durable and safety. The speed pulley is compact and quite convenient to carry or disposed, which makes it popular while it carries out its basic funtion as a general pulley for hauling or transporting equipement.