Specification Brand : Fretz 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." ItemName : Fretz, M9 Mushroom high Dome (18 mm) ItemPackageDimensions_Height : 11 centimeters ItemPackageDimensions_Length : 2.7 centimeters ItemPackageDimensions_Width : 3.7 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : hearing-aid-domes Manufacturer : Fretz ModelNumber : M-9 PartNumber : M-9 ProductDescription : M9 Mushroom high Dome (18 mm) ProductSiteLaunchDate : 2019-03-15T02:26:31.520Z Scent : Vented-Large Size : Extra Small SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1