Connexx Sleeve 3.0 M Vented Domes are stainless silicone coverings that protect your hearing aids while allowing them to remain comfortably positioned inside your ear. Connexx Sleeve 3.0 M Vented domes are suitable for small, medium or large size ear canals. Connexx 3.0 Sleeves fasten securely to Signia or Rexton RIC hearing aids and prevent them from accidentally coming off. To achieve maximum speech clarity, replace Connexx 3.0 Sleeves along with Connexx 3.0 Nanocare Waxguards monthly, or when your hearing aid is blocked and has stopped working. Original Signia product in manufacturer-sealed packaging.