Perform any functional-resistance pulley exercises with this simple and unique interchangeable tubing system. Attach the easy open-close tubing clip to a variety of accessories for a complete head-to-toe strength-building solution. Five levels of resistance that are ideal for any training level and allow you to work your way up. Easy-to-use interchangeable system allows for a multitude of resistance training exercises. Strong and durable construction, built for repeated use.