Note: The color of the product we ship is the color in the first picture, and the specification and quantity are shipped according to the quantity and specification described in the title. If you need to change the color or style, you need to contact us within 12 hours after placing the order. Our product description: Product Features: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information;2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Deep groove ball bearings, fashionable, slide flexible, compression wear.4.Suitable for furniture hardware accessories, mobile doors, glass sliding doors, aluminum doors and windows, shower pulleys and drawers, etc.5.This item is ordinary precision, adaptation to low speed, low load applications 6.These good precision bearings provide high speed and the convenience of removal shields for cleaning and re-lubrication.7.Bearing Steel construction, high quality and great for machines/equipment bearing use.Specifications:Product material:Engineering Plastics and Bearing SteelColor:WhiteBrand name: BQLZRBearing Model: 626ZZSize:3.0x0.6x1.0cm/1.18x0.23x0.39(DxdxT)Inside diameter: 6MMOutside diameter: 30MMThickness: 10MMSlot width: 6MMSlot depth: 3MMGroove Radius: 3MMSpeed: 890 rpm or lessLoad: 79KGWeight:49gPackage include:4 x U Type Groove Guide Pulley Ball Bearing Note: Because the model and display effect of the monitor may be different, there may be slight differences in color, and the size is manually measured, there may be an error of 1-2cm, please understand.