This arm booster Made of plastic and silicone material. It can be used by both men and women, which can exercise multiple parts triceps, biceps, shoulders, chest and back. It is very suitable for shape, tighten , exercise and more. Equipped with 3 interchangeable resistance bands, which can be used according to your needs.It is foldable make it easy to carry. There is no site requirement, you can use it to exercise at home, office and outdoors. 23 1/5"L x 9 4/5"W.