1.The tray is made of PP material, and the humanized design: comes with a pen case. 2.High-quality cold-rolled steel metal guide rail, widening and thickening, sturdy and durable, strong bearing capacity. 3.Slide rail with ball bearing and damping buffer, smooth and low noise. 4.The surface of the slide rail adopts multi-layer electroplating process, which is beautiful and practical, not easy to rust. 5.Easy to install. Comes with screw accessories.