Saving Space : 5 dumbbells in the space of 1. Enjoy80% space saving. 1-Second Effortless Weight Switch : Simply twist the handle, and switch the weight between 15lbs, 25lbs, 35lbs, 45lbs, and 55lbs. Comfortable to Hold : The bar is coated with TPE, which does not contain any toxins and are 100% safe for human health. Safety Design Locks Plates in Place : eliminating any worries about the plates dropping during exercise. Premium Materials : The weight plates are made of premium carbon steel coated with high-quality nylon, durable and pleasing to the eye. The tray is made of Polypropylene.