About Winter Evening Bearing KitsThe Winter Storm Series Bearings are all-new and durably designed. Built using the latest technologies and innovation such as HybridBlue rubber seals, 20% stronger chrome steel refined to P6 precision, and lubricated with industrial grade grease. In other words, we designed this kit to be long lasting, fast, and ultimately fun.This bearing kit is compatible with the Arrma models below:Big Rock 3s BLXGranite 3s BLX & MegaSenton 3s BLX & MegaTyphon 3s BLXThis kit includes the following premium bearings:12x18x4 (4 Pieces)6x12x4 (4 Pieces)Featuring:Premium P6 PrecisionHybridBlue Rubber SealsChromium Steel StructurePre-greased with synthetic micro bearing grease.Note: Please double check the bearings needed especially if you have upgraded to aftermarket parts. Thank you!