Watch Rubber Gasket Repair Parts O-rings Rubber thickness: 0.7mm, 15 diameters (16mm-30mm) 2 pieces each, total 30 pieces. 16mm 17mm 18mm 19mm 20mm 21mm 22mm 23mm 24mm 25mm 26mm 27mm 28mm 29mm 30mm It is recommended to replace the rubber gasket at the same time when replacing the watch battery. We offer watch rubber gasket silicone grease (sold separately) at a slightly lower price when bundled with the rubber gaskets. 【Caution】 ※ These rubber gaskets are basically round (circular) type O-rings for watches. ※ Depending on the diameter, the circle of the rubber gasket before installation may be slightly distorted as shown in the second image, but it will become circular when installed. ※ We will ship them in a single zip-lock bag as shown in the third image. ----- The following options can be added. If you wish to add them, please comment before purchasing. ・ Silicone grease for rubber gaskets 1 piece +350 yen ・ Yu-packet Post mini shipping +100 yen ・ Yu-packet Post shipping +130 yen ----- 【About Silicone Grease】 Silicone grease is for watch lid rubber gaskets. Applying a small amount to the rubber gasket with your hands makes it easier to fit the gasket into the lid, and slightly increases the water resistance and durability of the rubber gasket. We inspect the products, but please be aware that they are made overseas. ◆◆◆ ↓ We are selling various sizes of rubber gaskets and silicone grease. #swWatchSuppliesList We will discount the difference in shipping costs when bundled. ( -90 yen ~ for each additional item) ◆◆◆ Please feel free to ask if you have any other questions.