The 6000 Series Reusable Half Masks are economical, low-maintenance, simple to handle and extremely lightweight. 6000 series half masks by 3M can also be used with 3M? Supplied Air Systems for your increased convenience and flexibility. Head harness with cradle suspension for comfortable fit, Lightweight elastomeric material for comfort during long periods of work. Low profile design minimises interference with field of view, Twin filter design provides lower breathing resistance. EN 140:1998