Cyclic olefin monomers (COM) are unsaturated cyclic hydrocarbons with a double bond in the ring. They are used to produce cyclic olefin copolymers (COCs) and cyclic olefin polymers (COPs) with excellent optical clarity and low water absorption. Properties such as high transparency, low birefringence, and chemical resistance make them suitable for optical applications. Applications include lenses for glasses, cameras, and medical devices, as well as liquid crystal displays and filters. COM is also used to produce high-performance films and packaging materials.