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 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.Applicable: doors and windows, disinfection cabinets, printers, etc.4.Deep groove ball bearings, fashionable, slide flexible, compression wear.5.One pulley can load 77KG.Specifications:Product material: Nylon + bearing steel:BQLZRColor:OrangeInner diameter: 6MMOutside diameter: 29MMThickness: 8MMSlot width: 5MMGroove depth: 2.5MMRadius: R=2.5mmBearing weight: 77KGWeight:67gPackage include:4 x Bearing pulley 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.