Commercial Purpose Cross Sectioned O Ring is designed to be put inside a groove and then compressed during assembly by two or more parts, creating a seal. The O Ring can also be used for static and dynamic applications. The O Ring is available in several standards or non-standard inside diameters, cross sectional thickness and shore hardness. Commercial Purpose Cross Sectioned O Ring is made of various types of silicone rubber, ethylene propylene rubber, nitrile and viton which ensures optimum durability of use.