Bones Swiss Labyrinth Bearings are similar to the original Bones® Swiss bearing, but with a redesigned inner race and two labyrinth seals to keep dirt out even better than before. This significant increase in service life comes at a very small increase in retail cost, so the value is greatly increased. Double labyrinth non-contact, removable rubber shields allow easy cleaning and low friction. High speed nylon ball retainer provides added speed and strength. Pre-lubricated with Speed Cream™ racing lubricant. Skate Rated™ clearances, tolerances, materials and lubricant provide the best performance and durability possible. Imported.