10-Pack YoYo Bearings 5x9x3mm 5x9mmBall Bearings 5x9x3 Lot of 10 Bearings High Quality 10 Ball Bearings for many YoYos, this is a popular size that could be used in many Yoyos that have 5 mm bore, or any application that uses this size 5mm x 9mm x 3mm, Made from high strength chrome steel for durability and performance and can rotate up to 48000 rpm, each Comes with double metal shields (ZZ) to keep out dust and dirt, additionally, these bearings come pre lubricated with grease for