describe The double shielded design of the double shielded bearings keeps contaminants out and saves lubricant. High quality These bearings are made of high quality carbon steel and are durable and have a long service life. Applications These are specialty bearings used in many linear motion systems There are a total of 20 bearing parts available that can be used in many different projects. There are a total of 20 bearing parts available that can be used in many different projects. Ball Bearing Ball Bearing Ball Bearing Small Ball Bearing Ball Bearing Ball Bearing Ball Bearing Ball Bearing feature: Made of high quality carbon steel, these bearings feature a double shield to keep contaminants out and save lubricant. The bearings have a 2mm deep V-shaped groove and are typically mounted on guides or rails. These are specialty bearings used in many linear motion systems. There are 20 bearings in total that can be used in many different projects. Specification: Material: Bearing Steel