Compatibility and application: This hydraulic brake hose set is compatible with BH59 and BH90 systems. It is designed for models M355, M395, M615, M675, T750, M785, M985, M8000, M9000, XT, and provides a reliable replacement for mountain bike disc brakes. The hose length is 2.5 m to suit various bike setups. Material and construction: Made from nylon coating and yarn. Copper needles are used for BH59 and stainless steel needles for BH90. Outer diameter is 5.0 mm and inner diameter is 2.0 mm or 2.2 mm. Delivers longlasting performance and wear resistance in rugged cycling conditions. Sealing mechanism: The olive heads act as seals that deform upon use to guarantee a tight, leakproof connection, avoiding brake fluid loss and maintaining consistent hydraulic pressure for safe and effective braking. Set inclusion: Each package contains a full set for BH90 with 2.5 m oil pipe, 4 oil needles, and 4 olive heads, and similarly for BH59, providing all components for easy installation and immediate use in brake system maintenance or upgrades. Use scenarios: Replacing a worn or damaged hose on a BH59/BH90 system to restore consistent braking performance on a mountain bike. Upgrading a frame with longer routing or internal cable paths by using the 2.5 m hose length to achieve clean, secure routing. Performing routine maintenance or upgrades on an XT or compatible system, using the full BH59/BH90 kit for quick installation and immediate use.