S681 Stainless Steel Ball Bearings 1mm x 3mm x 1mm Lot of 10 Bearings 10 Stainless Steel Ball Bearings S681, S681 are a popular size that could be used in many application that uses the size 1mm x 3mm x 1mm. S681 Bearings are made of Stainless Steel, S681 bearings are full complement (no cage).