These are new rubber seal rings. Rubber gasket set that is installed on the watch back case, can cover the empty space between the watch band and movement. Adopted from rubber material, it is durable and long term use. These are nice helper for your watch. Features - Color: Black. - Material: Rubber. - Size: 8.50X5.50X2.00cm/3.34X2.16X0.79inch. - These are rubber round watch gaskets that keep your watch water resistant. - These are excellent replacements for many of watches, and also for non brand watch. - This is excellent for most watches,especially if you are doing watch battery replacement. - Gaskets will stretch a couple of millimeters and will also work on watches of shapes other than round. - It is manufactured with technology to ensure the of the product and can work for a long time. Package list: 1 of rubber rings