1、Effectively filter PM2.5 fine particles in the air, make air fresher. 2、Filter cotton is equivalent to a protective barrier, can prevent particles in the air from entering the respiratory tract through pipe and mask. 3、Ultra-fine filter cotton, mild and non-irritating, good filtering effect. 4、Important accessory for DeVilbiss respirator, help protect human health. 5、Light weight and in small size, easy to carry and install on machine. Features: Effectively filter PM2.5 fine particles in the air, make air fresher. Filter cotton is equivalent to a protective barrier, can prevent particles in the air from entering the respiratory tract through pipe and mask. Ultra-fine filter cotton, mild and non-irritating, good filtering effect. Important accessory for DeVilbiss respirator, help protect human health. Light weight and in small size, easy to carry and install on machine. Specification: Condition: 100% Brand New Item Type: Filter Cotton Quantity: Black: 2pcs, White: 6pcs Range of Application: for DeVilbiss Respirator DV54/55/56/57 Size: Black: Approx. 4.3 x 3.3cm / 1.7 x 1.3in White: Approx. 4.5 x 3.3cm / 1.8 x 1.3in Package list: 6 x White Filter Cotton 2 x Black Filter Cotton