[Strong & Sturdy] The Ultimate Gymnastics Training Bar and Horizontal Kip Bar with Expandable Levels for Junior Gymnastic Training! Strong Steel Legs, Sturdy Professional Design with a Heavy-Duty Rail made from high-quality fiberglass core with two bottom spreader stability bars! Excellent for Hanging, Swinging, Climbing, developing coordination, improving kids balance, strengthening the body and core, while increasing flexibility! Durable, Strong, Interactive Hi-Quality Design.