1.The gears are with the best rubber, not easy to be broken.2.We have different size for the gears such as: 6132A1-27gear(Outer diameter 108), 6132A1-41gear(Outer diameter 129), 6140-27gear(outer diameter 118), 6140-41gear(outer diameter 139).3.Normally the different size of gear can be used for lathe machine C6132A1 and C6140. If your machine is some other models, pls kindly let us know more information, we will recommend the correct size for you.We are the largest manufacturer and wholesaler of machine tool accessories in domestic China. More than 80% of the domestic machine t factories are our customers. We have three modern production workshops, all of which are high configuration CNC machines, which can ensure both high efficiency and quality. Therefore, our machine tool accessories can be of high quality and low price in China, which has been recognized by many machine tool manufacturers. Metalcnc tools are the biggest option for your machines.We provide 12-month free maintenance. The buyer should return the product in the original conditions to us and should bear the shipping costs for return, If any part is required to be replaced,the buyer should also pay for the costs of the parts to be replaced.Before returning the items, please confirm the return address and the logistics method with us. After you give the items to the logistic company, please send us the tracking number. As soon as we receive the items, we will repair or exchange them ASAP.We do our best to serve our customers the best that we can.We will refund you if you return the items within 15 days of your receipt of the items for any reason. However, the buyer should make sure that the items returned are in their original conditions. If the items are damaged or lost when they are returned, the buyer will be responsible for such damage or loss, and we will not give the buyer a full refund. The buyer should try to file a claim with the logistic company to recover the cost of damage or loss.The buyer will be responsible for the shipping fees to return the items.Normally all linear scale and DRO can be shipped out within 5days after the payment, and we will ship the goods via DHL, FEDEX,UPS or TNT. And we will also ship from EU stock for some products which we have them in oversea warehouse. Thanks!And Please note that buyers are responsible for all additional customs fees, brokerage fees, duties, and taxes for importation into your country. These additional fees may be collected at time of delivery. We will not refund charges for refused shipments.The shipping cost does not include any import taxes, and buyers are responsible for customs duties.