2 x 6 x 2.5 Open Stainless Steel Ball Bearings 10 Ball Bearings 2 x 6 x 2.5 Open Stainless Steel Ball Bearings this is a popular size that could be used in many fishing reels, Bearings are made of Stainless Steel, inner diameter is 2mm, outer diameter is 6mm and width is 2.5mm.