3M™ 6500QL Series reusable gas and vapor half masks have been designed with harsh and contaminated work environments in mind; thanks to the trigger mechanism (QL), you do not need to take off the safety helmet or face shield when you want to take off or put on the mask; compatible with all 3M bayonet filters (2000, 5000, 6000 series); extended life thanks to durable silicone material (bonded silicone is used in the mask, which is not released into the environment - the product is also suitable for paint shops); compatible with 3M welding and grinding shields