This product is made of import high quality zinc plated steel with ball bearing in the wheel, mainly exported to south American drawer slideFeatures:1) USA type2) Size: 300 - 550mm3) Color: zinc 4) Thickness: 0.8mm, 1.0mm, 1.2mm5) Wheel: ball bearingOuter packing: 30stes/ctn Drawer Slide, USA Type