Mfg. Part No.: 80757 Brand: Honeywell Replacement Headstrap, For 5400 Series. Secures head gear in place. Built for comfort and durability. Designed as a replacement part for 5400 series. Height [Nom]=2 1/2 in. Length [Nom]=5 in. Material=Plastic. Used With=5400 Series. Width [Nom]=6 in. Wt.=0.18 lb. .