EXTRALITE Cassette sealing ring Campagnolo ExtraBolt 3.4 Lightweight cartridge holder for Campagnolo. Available in a variety of colors, they provide an individual touch on every wheel. lasered logo. Technical specifications: Material: 7075 T6 aluminum Compatibility Cassettes: Campagnolo 11-speed , smallest pinion 11 teeth Color: black, blue, gold and red Weight: 3.4 g Scope of delivery: 1 piece Note: Only suitable for cartridges whose smallest pinion has 11 teeth! For assembly / disassembly the closing ring will be a Shimano SRAM compatible cartridge key required!