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For 7mm skate axles. Each labyrinth seal fits into a groove cut into the inner race without touching the walls or bottom of the groove, so that dirt and water must go through a ?labyrinth? or ?U? shaped path to get to the inside of the bearing. The labyrinth seals are still removable for cleaning, but the skate time between cleanings is greatly increased. The Bones Bearing team of skaters who have tried these note that they are just as fast as ever, but are quieter, and stay clean longer. Bones Bearing factory testing confirms this.New 7-Ball Swiss bearing with double labyrinth seals! Each labyrinth seal fits into a groove cut into the inner race without touching the walls or bottom of the groove, so that dirt and water must go through a labyrinth or U shaped path to get to the inside of the bearing. The labyrinth seals are still removable for cleaning, but the skate time between cleanings is greatly increased. The Bones Bearing team of skaters who have tried these note that they are just as fast as ever, but are quieter, and stay clean longer. Bones Bearing factory testing confirms this. Features- For 7mm axles (627 Bones) - Set of 16 bearings- Pre-lubed with Speed Cream- Instructions- Sticker - Features - Faster- Stronger- Longer Lasting- Pre-Lubricated with Bones Speed Cream- Labyrinth, Removable Rubber Seals- Removable High Speed Nylon Ball Cage- Needs less cleaning & relubricating- Bones Skate Rated & Design Quality- Each package comes with set of bearings, pre-lubed with Speed Cream, instructions and a sticker.

• 16-pack