Specifications:Weight : 0.134Ounces (4Pcs Wheels +1X Fingerboard Tool)Wheel Size : Inner Diameter 1.5Mm X Out Diameter 7.5Mm X Height 5MmBearing Size : Inner Diameter1.5Mm X Out Diameter 4Mm X Height 1.2Mm Wheel Material : UrethaneBearing Material : Chrome SteelFeatures:Each Wheel Is Equipped With A..