Specification Brand : Phonak BulletPoint1 : To account for the different sizes of ear canals, four click sleeve sizes XS, S, M and L are offered. BulletPoint2 : To take different amplification needs into account, all four sizes are available in both closed and vented versions. BulletPoint3 : In the closed version, used for higher amplification needs, a small vent of 0.8mm diameter and 4mm length realizes an equivalent vent size of 1.6mm diameter and 16mm length. BulletPoint4 : In the vented types, two short openings are incorporated on both sides, providing an equivalent vent size of 16mm length and >4mm diameter. BulletPoint5 : "In addition, turn protection and side indication provide an extraordinary wearing comfort." Color : Transparent ExternallyAssignedProductIdentifier1 : 0659355826591 ExternallyAssignedProductIdentifier2 : 659355826591 ItemName : Phonak Hearing Aid Domes Medium Open 2 Pack ItemPackageDimensions_Height : 6.2992 centimeters ItemPackageDimensions_Length : 2.2098 centimeters ItemPackageDimensions_Width : 5.207 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : hearing-aid-domes Manufacturer : Sonova Material : Silicone ModelNumber : CS-C-S-4PC NumberOfItems : 1 PartNumber : CS-C-XS ProductDescription : Phonak Hearing Aid Domes Medium Open 2 Pack. These fit all older hearing aid models prior to Marvel. ProductSiteLaunchDate : 2017-12-12T23:06:08.991Z Scent : Closed Size : Extra Small Style : Uncorded SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1