Super hard Silicone Nitride balls fitted to precision ground races give the ultimate bearing for low friction and long life. The shields are non contact plastic and easily removed and replaced for cleaning.
Schumacher Bearing Guidlines
Yellow = ABEC5, oil filled, shielded, steel balls recommended for relatively clean conditions. Schumacher On Road cars kit specification.
Red = ABEC5, grease filled, double rubber seals, steel balls recommended for wet or dirty conditions. Schumacher Off Road cars kit specification.
Orange or Grey = ABEC 5, oil filled, shielded, extra hard ceramic balls for higher efficiency. Recommended for On Road.
Black = Pro High Precision German or Japanese manufactured, rubber seal. Recommended for Off Road.
Metal = Pro High Precision German or Japanese manufactured, shielded. Recommended for On Road.