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Hydraulic brake O ring compatibility, compatible with Shimano XT, compatible with Shimano XTR, compatible with Shimano SLX systems, checks fit for common caliper and lever service points, confirm sizes 8x1mm and 9x1mm. Nitrile rubber seal performance, NBR resists common mineral oil brake fluid, forms tight seal at bleed port, banjo, and piston interfaces, flexible for service work and routine rebuilds in workshop or home. Mixed size kit 8x1mm 9x1mm, includes 8 pieces OD 8mm cross section 1mm and 4 pieces OD 9mm cross section 1mm, supports precise replacements where factory sizes vary across assemblies and model years. Bicycle repair usage scenarios, practical for trail tool kits, home tune ups, shop maintenance, travel spares, supports disc brake upkeep to reduce fluid leakage and keep lever feel consistent on rides. Installation and maintenance tips, clean grooves and fittings, lightly oil before seating, avoid twisting, replace aging seals during caliper or lever overhaul, store extras in the resealable pouch for quick access.