FAMOUSLUMINOUS glow stone & gravel was madefrom photoluminescentpigment and innorganic material.Ithas high density and can resist hightemperature.  Itlooks like same as nature stone in hardnessand appearance.We can provide you size rangefrom 1-40mm,or customized by yourrequirements.Our luminous/glowstone & gravel has 15-20years servicetime. Since the special feature which itcan glowin night, that it widely used in many placesas decorationor safety indication sign,such ashome wall, floor, park,path &road,,gallery and others places.