The 1-1/4” x 72mm High-Speed Ceramic Ball Bearings are made with low contact seals, with little to no grease for free spinning.
We recommend oiling bearings every race day with a bearing oil like Lubtek or TrI-Flo, not a penetrating oil.
Ceramic Bearings is typically freer and has better heat dispensation than steel. The trade-off is durability. Maintenance is crucial, we recommend these to be used on asphalt tracks. The ceramic can wear and fail if ran on sandy tracks or tracks with large mineral deposits(small pebbles, rocks, sand, etc).