Sordin Supreme Pro X hygiene kits are available as replacement parts for all Sordin hearing protectors. The kits include one pair of replacement gel and one pair of inserts, one for each cup.Replaceable sealing rings in Gel that fits all Sordin Supreme Pro and Pro X models. The cushions are filled with gel which makes them very comfortable to use. Perfect for shooters who are wearing glasses. The hygiene kit should be replaced at least twice a year for standard use to ensure that the noise attenuation performances are maintained.