Easy Installation for Watch Repair & Maintenance：The flexible rubber sealing rings are easy to install and remove, fitting securely into watch back grooves. No exceptions.
180 Pcs O Ring Watch Gasket Kit, 18 Sizes Rubber Seal O Rings 16–30Mm, Waterproo
Complete Watch Gasket Kit (180 Pcs, 18 Sizes). The flexible rubber sealing rings are easy to install and remove, fitting securely into watch back grooves. Waterproof & Dustproof Watch Back Seal. O Ring Watch Gasket.