Stainless steel manufacturing, rust - proof, - , outdoor use can also prevent pulley . There are two carbon steel ball bearings inside the pulley, which can reduce the friction of the wheel. The pulley turns more flexibly and has no noise. Compared with other pulleys, pulley wheel support plate is thicker, the wheels are stronger and the bearing capacity is stronger. Pulleys are removable for easy installation. A single small pulley can carry 660lb/300kg, Weight: 0.55005334369 Pounds, Manufacturer: Jaywool