We are sorry to hear about this.We understand your disappointment and upset.Seriously apologize for the inconvenience that has caused you. We will send the sample for you again, and the freight will be paid by us. Our sliders is made of zinc alloy, the sample is placed for too long, so there is a little oxidation, but all our orders are produced immediately, there will be no such problem.We will be responsible for any quality problems. Thanks your feedback .In the future we will take steps to improve our service and product quality. We sincerely hope this displeasure will not affect our subsequent cooperation.Having any problems ,please feel free to contact us,we are here,thank you.