Rubber Watch Case Back O Ring Round Gasket 16mm-39mm Color: BLACKThickness: 0.5mmMaterials: RUBBERPackage/Includes: 1 PCS x GASKEThis o-ring watch case back seal assortment is a gasket kit for watchmakers and others who work on watch case backs. These round gaskets are made of solid tube rubber to create an airtight seal that prevents water from entering the watch case. They are flexible enough to fit not only round watch case backs but, square, rectangle and other fancy shaped case backs. As this assortment includes gaskets of various sizes, you should definitely be able to find a correct match for the gasket you need to replace.Please confirm your watch case size before ordering ! First, before you order your new replacement gasket, you must measure the inside diameter of the back to ensure the gasket will fit tightly. Take the watch case back and place it upside down on a flat surface. Before measuring the gasket, you will need to remove the old gasket if it has not already broken and fallen off on its own. Remove the old gasket by pulling the gasket away from the back with your tweezers and sliding it off the back. Then, using a digital gauge to get an accurate measurement, measure the inner diameter of the gasket, where the old gasket was seated. This will get you the diameter you need for your new gasket. SHIPPING & POLICY >>Payment: We accept payment via PAYPAL ONLY. Payment must be made within 48 hours of auction closing. (Non-payment may result in a UPI (Unpaid Item) being put on your account. eBay will automatically close your account if you accumulate 4 UPI's total.) All california residents will be charge local sales tax. S&H will be determined based upon the SHIP TO address. PLEASE NOTE: S&H DOES NOT INCLUDE DUTIES, LOCAL TAXES OR ANY OTHER IMPORTATION FEES. >>Shipping: Items will be checked very well and processed within 24-48 hours of payment verification. We only ship to confirmed PAYPAL addresses. Your PAYPAL address MUST MATCH your Shipping address. The images shown the item color may have slight deviation，Please note before buying it. SERVICE TRANSIT TIME is provided by the carrier and excludes weekends and holidays. Transit times may vary, particularly during the holiday season. If you have not received your shipment within 30 days from payment, please contact us. We will track the shipment and get back to you as soon as possible with a reply. Our goal is customer satisfaction!PLEASE NOTE: Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer's responsibility. IMPORTANT NOTE FOR INTERNATIONAL BUYERS: International shipment may take 2-6 weeks for delivery depending on your country's customs and postal system delays. Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying. International packages may or may not show package progress and tracking, this depends on your country's postal system and whether they offer this service. Small packages that are shipped First Class Mail will not show progress there is only a shipping receipt for these shipments that we keep on file. >>Returns/Refunds: You have 7 days to contact us and 10 days to return it from the date it was received. If this item is in your possession more than 7 days, it is considered used and WE WILL NOT ISSUE YOU A REFUND OR REPLACEMENT. There are NO EXCEPTIONS! All returned items MUST BE in the original packaging and you MUST PROVIDE us with the shipping tracking number, specific reason for the return, and your eBay ID. We will refund YOUR FULL WINNING BID AMOUNT, upon receipt of the item in its original condition and packaging with all components and accessories included, AFTER BOTH Buyer and Seller cancel the transaction from eBay. OR, you may choose to have a replacement. All returns are subject to a 15% restocking fee. Shipping Charges that you paid are not refundable, Return shipping is to be paid by the Buyer. >>Feedback: We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback is very important to us.Please do not leave any negative or neutral feedback before contacting us,we will exert our most efforts to resolve your any problem more than you could thought.Contact us By Ebay not By Email as possible as you can, since they are not in same system and usually the buyer who contacts us by ebay will get the priority reply and help. Add a map to your own listings. FREE Trial!