Forged and CNC machined AL6061 thread-in cups for a superior fit and noise-free operation Low-friction dual seals protect the bearings from harmful contaminants Sealed premium bearings are serviceable Designed for installing SRAM DUB 28.99mm spindle cranks into BSA threaded frames 68/73mm ENG SRAM DUB 28.99mm AL6061 100g BlackUPC/EAN/GTIN: 888571069981