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: Feature:Wheels are made of nylon, ball bearing, two wheels to withstand 100 kg.Most of the copper, 304 stainless steel micro-bearing Engineering Plastics zinc alloy brass axis ,never rust.Rugged construction, greatly improve load-bearing capacity, sliding smoothly, ultra-quiet, longer life, and the use of advanced surface treatment, to make products more upscale and endurance.Specification:Product material:Copper core axis and nylon wheelColor:WhiteApplicable Thickness: 5mm-8mmGlass Hole: 10.5-12mmWheels Thickness: 5.5mmWheels Diameter:19mmDimension:33 x 19mm or 1.3 x 0.75inch(L x Dia)Weight:22gPackage Include:1 x Partiality Shower Door Roller 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.