10-Pack HPI Mugen OFNA Bearings 5x10 MiniatureBall Bearings 5x10x4 Lot of 10 Bearings High Quality 10 bearings Wheel Ball Bearings for many applications, this is a go to bearing size that fits lots of RC cars and trucks, or any application that uses this size 5mm x 10mm x 4mm. Made from high strength chrome steel for durability and performance and can rotate up to 71000 rpm, each Comes with double metal shields (ZZ) to keep out dust and dirt, additionally, these bearings come pre lubricated with