1Super soft and flexible Oring, easy to install, used to keep watches waterproof, prevent water getting into watch. 2Including different sizes can meet different size requirements, flexible, wearresistant and durable, high elasticity and reliable in use. 3Oring rubber gaskets last a long time and you don't have to worry about durability. 4Compact and lightweight design makes rubber watch rings easy to store without taking up too much space. 5Storing in a labeled and organized box, no need for sorting and sizing, very easy and convenient to use.