This specialty tube is designed for use with an exercise step. The nylon center strap reduces wear and tear on the tube while allowing you to add a new dimension to your tubing and step workouts. Nylon handles with hard PVC grips. 2 independent tubes: 21" tubes connected by a 21" nylon strap. 63". Level: Extra Heavy. Color: Black. Recommended for: Highly advanced exercisers who have mastered form and technique.