Product Name: Yimeisi Dust-Proof and Anti-Smog Mask - P2.53D Type Comfort Fit Mask Quantity per Box: 500 pieces Our company produces two types of masks: 1. Washable Nano Antibacterial Anti-Smog Mask: The outer layer is made of international new materials, with a full cotton fiber structure. The middle layer is made of nano-processed microfiber adhesive fiber, and the inner layer is made of British PE biological film. 2. Daily Professional Anti-Smog Mask: The material is mainly non-woven fabric and polypropylene. The ear portion is made of elastic nylon. It is designed for adults and children to use for anti-smog, which cannot be washed or modified.