1. Easily turn the handle for 1 second to adjust "2.1 Fiber laser slicing of dumbbell plates with pure steel material; 2.2 The appearance of the product is processed by a precision CNC lathe with smooth edges; 2.3 The appearance of the product adopts electrophoresis technology to prevent rust and be beautiful (anti-drop, anti-embroidery, maintenance-free). " 3. The handle is made of high-strength nylon material, and the non-slip handle adopts a diamond-shaped design in line with human mechanics. 4. The dumbbell seat is made of PP material, mellow, stable, and odorless.