High quality materials combine to produce the Rollerblade(R) SG-9 Bearing Kit. Durability improves thanks to precise tolerance and combined silicone and grease lubricants. The bearing delivers with less resistance and repels water with the silicone additive. In addition, SG-9 Bearings protect against dirt and debris. Experience an evolution of technology and optimal performance when you use the Rollerblade(R) Bearing Kit. FEATURES: Bearing kit SG-9 2011 16-pack Durability with silicone and grease combination lubricants Less resistance Repels water Dirt and debris protection