ABEC-3 Stainless Steel Ball Bearings 3 x 6 x 2.5 mm Lot of 10 Bearings 10 Stainless Steel Ball Bearings ABEC-3 quality, this is a popular size that could be used in many application that uses this size 3mm x 6mm x 2.5mm. Bearings are made of Stainless Steel.