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