This single and double bar is made of steel, which is very hard and durable, making it suitable for all types of people, such as office workers, sports students, or professional athletes. The size of this bar is 93 23 39 (inch), which is perfect for indoor or outdoor use, and can be used in many different ways, so you can train your muscles anytime and anywhere. Rattantree Multi-function Pull-ups Horizontal Bar & Parallel Bars Fitness & Beauty in Black