Jagwire sealed end caps feature a small rubber o-ring to help prevent dust and water from entering the housing.Sealed end caps feature a small rubber O-ring in the base that helps prevent dust and moisture from entering the housingTypically used with derailleur systemsItem SpecificationsColorBlackUnit of SaleBottle of 50Fits4mmMaterialAluminum Jagwire Sealed End Caps Housing End Cap EAN: 4715910020951