1.Made of new PE plastic, non-toxic and tasteless. 2.Thickening, ribs, rounded corner design, reduce damage to the product during collision, heavy pressure without deformation, durable. 3.The bottom of the box is neatly aligned with the box mouth. After stacking, it can prevent the box from sliding and save space. 4.It can place large and small metal parts, pens, paper and other objects to prevent the pieces from being lost.