Jagwire 4mm Sealed Alloy End Caps Bottle of 50, BlackJagwire 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 housing Typically used with derailleur systems Item Specifications Color Black Unit of Sale Bottle of 50 Fits 4mm Material Aluminum Jagwire Sealed End Caps Housing End Cap EAN: 4715910020951