For protection against non toxic dusts mists and fumes based on water and oil The Duramesh structure makes the mask strong and durable reducing consumption and maintaining shape The ActivForm seal automatically adjusts to different face shapes and movements The strap and clip allows you to hang the mask comfortably around the neck whilst not in use Supplied in packs of 20 Standard: EN149:2001 + A1:2009 FFP1 NR D 4x NPF - Nominal Protection Factor 4x APF - Assigned Protection Factor