Hygiene Kit For Impact/Imapact H/Radio/Radio HV/Electro/Electro H The hygiene kit consists of a pair of snap-in ear cushions and a pair of foam ear cup inserts. The inserts are for use with, Impact, Impact H, Radio, Radio HV, Electro and Electro H only. The hygiene kits extend the life and performance of your earmuffs plus the kit is quick and easy to use. FEATURES and BENEFITS: For use with Impact, Impact H, Radio, Radio HV, Electro and Electro H only Extends performance and life of earmuffs Quick and easy to use KIT INCLUDES: One pair of snap-in ear cushions One pair of foam ear cup inserts Note Replace every six months.