Many working environments will produce harmful gases and dust. We can help most people by providing protective equipment. 2Pcs Cartridge Covers are provided for you to place the filter cotton on your face mask, providing you with long-lasting protection. The cover with hollow design ensures you breath clean, fresh air more easily when you 're servicing equipment, cutting, welding, coating, manufacturing, shooting, etc.. Compatible with T-shape filter box. Notch Design: The transparent cover with notch design can perfectly fix the filter cotton in place. Compatibility: These 2Pcs filter covers can fit for T-shape filter box such as 6001 organic vapor cartridge. Hollow Design: Hollow design on the center ensures you breathe more easily. Raised Dots: Raised dots on the edge ensures the cover can close firmly and not easy to open accidentally. Widened Edge: Both sides are designed with widened edge to allow for easily open. Brand: iMounTEK Product Type: Organic Vapor Cartridge Cover Color: Transparent Material: Plastic Per Filter Cover Size & Weight: 11x10x2.5cm/4.33x3.94x0.98in; 11g/0.02lbs Filter Cover Package Size: 15x13x4cm/5.91x5.12x1.57in Filter Cover Package Weight: 32g/0.07lbs 2 x Filter Covers