Nylon Bearing Pulley, 50mm Fitness Pulley Home Gym Attachment, Strength Training Accessory Lightweight & Easy to Install at Altitude, Suitable for Health ClubNylon bearing pulley is made of nylon, durable, wear resistant, waterproof, long service life. No friction spark, high safety performance, ensure easy movement. Nylon pulley is lightweight and easy to install at altitude. It is an accessory to fitness equipment and can be used for fitness equipment and garage door pulley systems. Suitable for health club, family fitness, business or private use, necessary fitness equipment accessories, easy to change.