Utility: Alexis King Reflective Cats-Eye Road studs are made of Plastic and are suitable as road dividers, as well as for marking lanes, road diversions, sharp turnings, speed breakers, signals, road junctions, narrow bridges, hair-pin bends in hilly areas, etc. Most importantly they are ideal for highways/city roads. They also add Safety and Beauty to driveways of housing/commercial complexes and bungalows, factories, hotels etc. This stud confirms to A.S.T.M.-4280 specifications.