3M 6000 series ½ mask respirators uses 6000 series filters and cartridges which also fit the full face 6000 series by 3M. Remarkably comfortable with soft, lightweight facepiece and the easy-to-adjust head straps and is reusable. Just dispose of the cartridges/filters when used to capacity (increased breathing resistance or taste/odor of product). Easily cleaned and maintained between uses. Choose from Small, Medium, and Large.