Front perspective mask is thick. Plexiglass, very thick, excellent quality, clear vision. Application of places: fertilizer factories, cement factories, polishing industry, etc. The lens is transparent plexiglass which produces the properties strong protective canvas fabric hat surface, protective, comfortable to wear 100% brand new and quality. Front perspective mask is thick. Plexiglass, very thick, excellent quality, clear vision Professional anti-dust equipment Breathable, lightweight and comfortable to wear, suitable for soft sanding, grinding, polishing and other places Application of places: fertilizer factories, cement factories, polishing industry, etc. The lens is a transparent plexiglass that produces the strong protective properties of the surface of the canvas fabric hat, protective, comfortable to wear Neck Diameter: approx. 9.45 inch / 24cm Bottom Diameter: Approx. 19.7 inch/ 50cm Transparent Mask Size(L x W): Approx. 6.7 x 5.1 inch / 17cm x 13cm Total length from top to bottom: approx. 15.7 inch / 40cm App locations: The fertilizer factory, the cement plant, the polishing industry, the shot blasting industry where dust is generated in the industry Sandblasting, stone splash protection, and other protective occasions Package includes: 1 x Protective mask