In metal and plastic, with wheels. It slides easily and is very sturdy.Suitable for cupboards, cupboards, bookcases and other office furniture.< p>Note: the diameter of each wheel is 14.5mm.Before buying, please make sure it matches your furniture sizeFeatures:Made of metal and plastic, with wheels. It slides easily and is very sturdy.Suitable for cupboards, cupboards, bookcases and other office furniture.< p>Note: the diameter of each wheel is 14.5mm.Before buying, please make sure it matches your furniture size.Details:Material: metal and plastic.Color: Silver / WhiteDimensions:Central thickness: 5.5 mmExternal width: 17.5mmSuitable for track height: 15-20 MMInner width of sidewalk soft channel: 18-23MMTrack center width: 6-7.9MMWheel diameter: 14.5 mm.Package content:A set of 10 wheels.Note: the data is all manual measurement, please allow 1 - 3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received Delivery Quantity: (according to the main image)