Reusable Halfmask with Bayonet Filter Connection in Silicon BLS 4000Next S (S/M) - Sparex Part S.164113Reusable Halfmask with bayonet filter connection in Silicon BLS 4000Next S (S M) Sparex Part No. S. 164113 Features EASY AND FAST MAINTENANCE It can be disassembled in less than a minute making cleaning and maintenance much easier. NEW MASK 25% LIGHTER The reduction in the thickness of the oronasal allowed a 25% reduction in the weight of the half mask, which appears to be among the lightest on the market. HEAD HARNESS Thinner and lighter head