The new Zealous bearings will make your friends jealous when you’re beating them down the hill! The machined precision 8mm axle holes fit snug on the axle reducing slop. The Zealous bearings have green rubber inner and outer seals to keep dirt, debris, and thane out of the bearings. When testing the bearings are pre-lubricated with Archoil Nanoceramic Grease is a long-lasting grease that will break in after a session or two. The grease that Zealous uses helps eliminate friction over time and reduces corrosion on the inside of the bearings. We recommend trying out a set of the Zealous Bearings before you head out to your favorite hills.