Enduro Abec-5 Cartridge Bearing The Enduro Abec-5 Cartridge Bearingfeature grade 5 chromium steel balls, built with the highest of precision. The vacuum de-gassed process provides the purest chromium alloy steel, hardened to R-62, which I extremely tough and ultra-durable. The Bearings are filled both sides with Mobilgrease XHP 222 mineral oil based grease, giving you the best protection for a long lasting set up. Specsifications Grade 5 Chromium Steel Balls. 52100 High Carbon Chromium Alloy Races. Graphite/Nylon Ball Retainers | Enduro | Abec-5 Cartridge Bearing 61804 Bearing 20X32X7 | Nylon