Features: This ball bearing is made of high quality ceramic ZrO2 and PTFE material, features high precision, high speed, and wear small. Small frictional resistance, low power consumption, high mechanical efficiency. This is a sealed ball bearing, with good dustproof effect. Resistant to corrosion and able to operate in harsh conditions. Standardization size, used for machinery manufacturing, equipment installation and maintenance. Specification: Material: PTFE, Ceramic ZrO2 Model: 6001-2RS Sealed dustproof form: 2RS Inner diameter: 12mm or 0.5inch Outside diameter: 28 mm or 1.1inch Thickness: 8mm or 0.3inch Weight: 19g or 0.7oz Package list: 1 x ZrO2 Ball Bearing 1This ball bearing is made of high quality ceramic ZrO2 and PTFE material, features high precision, high speed, and wear small. 2Small frictional resistance, low power consumption, high mechanical efficiency 3This is a sealed ball bearing, with good dustproof effect 4Resistant to corrosion and able to operate in harsh conditions 5Standardization size, used for machinery manufacturing, equipment installation and maintenance. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.