This new Labyrinth 2 has been improved with tighter seals and more durable shields for long lasting roll! This bearing is similar to the original Bones Swiss bearing, but with a redesigned inner race and two new labyrinth seals to keep dirt out even better than before. Bones Labyrinth seals are non-contact, so they do not increase friction, only the distance dirt particles must travel to get past the seals. The only difference you will notice is that the labyrinth seal Bones will last several times as long as the original Bones between cleanings. This significant increase in service life comes at a very small increase in retail cost, so the value is greatly increased. Features - 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.