HIGH QUALITY - These miniature bearings are made of high quality steel for low noise and long service life,and they are double rubber sealed to avoid contaminants entering and save lubricant.SIZE - Bearings have a 3mm inner diameter, a 10mm outer diameter, and a 4mm thickness.WIDE RANGE OF APPLICATION - These are great for 3mm shaft/rod projects such as mechanical equipment,electrical instruments, toys.WIDE TEMPERATURE RANGE - 20 to 120.GUARANTEE - We are confident the quality of our product is 100% qualified. If there is any question, feel free to contact us. We will offer the best service for you. Specifications: ISO Certificate ISO 9001:2008 Dimension ID (Inner Diameter): 3mm OD (Outer Diameter): 10mm Thickness: 4mm Material:Chrome Steel ABEC Tolerance Codes ABEC 1Closure codes 2RS  (Two side rubber seals) Lubrication Wide Temperature Range: - 20 to 120 Basic Load Ratings Cr   KN = 0.64Cor KN = 0.23Vibration Level Z1  (P0) Package Includes: 10 x Bearings Track Page Views WithAuctiva's Counter