TRIXES 16 Frictionless Abec 9 Skateboard Roller Skate Bearings STANDARDS; Abec-9 precision 608RS IDEAL FOR; High speed slow-friction, pre-lubricated and perfect for downhill luge style skating, rollerblading or various spinners SEALING; 2x low-friction blue single lip rubber seals WATERPROOF; Can be used in all types of weather, also dust and dirt proof. Sealed for life bearing SIZE; Universal standard size 8mm core diameter x 22mm outer diameter x 7mm width