Features: These miniature bearings are made of high quality steel for low noise and long service life. They are double rubber sealed to avoid contaminants entering and save lubricant. Bearings have a3mm inner diameter, a 10mm outer diameter, and a 4mm thickness. These are great for 3mm shaft/rod projects such as mechanical equipment,electrical instruments, toys. There comes total 10 pieces miniature bearings which you may use for many different projects. Specifications: ISO CertificateISO 9001:2008 DimensionID (Inner Diameter): 3mm OD (Outer Diameter): 10mm Thickness: 4mm MaterialChrome Steel Qty10 PCS ABEC Tolerance CodesABEC 1 Closure codes2RS (Two side rubber seals) LubricationWide Temperature Range: - 20to 120 Basic Load RatingsCr KN = 0.64 Cor KN = 0.23 Vibration LevelZ1 (P0) Package Includes: 10 x Bearings Package List 1These miniature bearings are made of high quality steel for low noise and long service life 2They are double rubber sealed to avoid contaminants entering and save lubricant 3Bearings have a3mm inner diameter, a 10mm outer diameter, and a 4mm thickness 4These are great for 3mm shaft/rod projects such as mechanical equipment,electrical instruments, toys. 5There comes total 10 pieces miniature bearings which you may use for many different projects