About us, Professional factory, welcome to our store for more choices with best price. What we pursue is your satisfaction of our service, not just for our goods. For any reason you are unsatisfied with our product at any time, simply contact support for exchange or refund. We will reply you about any question you ask within 24 hours. Specifications:Color: blue,blackMaterial: stainless steel, aluminum.Size:100X16mmPackage Includes: 5pcs x grinder wheel.Note: Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same. We highly appreciate all customers opinions to improve the selling, also if anything you unsatisfied, please contact us for probable best solution.