3M HF 800 04 ~ Secure Click Head Harness Assembly with Speaking Diaphragm 7100217704 Material_HDP (High Density Polyethylene) These impact resistant gloves feature enhanced SS HND SSXPU3OF 7 These impact resistant gloves feature enhanced back of hand protection and a blended DuPont Kevlar fiber that stands up to heat while providing 360 degree ANSI Level A4 cut protection and FR 57 cartridges only 3M Secure Click Head Harness Assembly with Speaking Diaphragm HF 800 04 The 3M Secure Click Head Harness Assembly with Speaking Diaphragm is a replacement part for 3M Secure Click HF 800 Series Half Facepiece Reusable Respirators