Replacement spacer pack for Wheels Mfg. 29mm spindle (SRAM DUB) bottom brackets. Bearings sold separately. Pack Includes: - (2) - Silicone Dust Seal, 29mm ID, 42mm OD - (2) - 0.5mm, 29mm ID Crank Spindle Spacer - (2) - 1.0mm, 29mm ID Crank Spindle Spacer