Szliyands aluminum knobs are CNC machined from high quality solid aluminum with a durable anodized finish for a well-crafted product. This aluminum knob is the perfect replacement for your old knobs to replace or upgrade.If there is any item quality problem, we hope to improve your good shopping experience in this store by giving you an exchange or refund, if you have any questions you can contact us, we will usually reply your questions within 24 hours. Thank you for visiting our store and wish you a happy life.