BERP Bio Bearing & Linkage #7 ? Medium

BERP BioOil No. 7 is a medium-viscosity oil designed for rotor valve bearings and linkage points. It is petroleum-free and made for rotary brass instruments such as French horn, trombone, euphonium, baritone, trumpet, and tuba where thicker bearing oil is needed instead of standard piston valve oil. This oil is useful for the moving contact points around rotor assemblies, including bearings, spindles, and linkage areas. The No. 7 medium formula is a good choice for routine rotary valve maintenance when the instrument needs smooth movement without using an oil that is too thin for the bearing surfaces.