Color are from an environmentally friendly ceramic stain on porous fireproof material. We offer a variety of sizes, and there is also a variety of colors available. Lite stone uniform balls can be used in fire bowls, fire pits, and fireplaces, either indoors or outdoors. They can be used with natural and propane gas (do not use in wood or pellet burning fire pits). Lite stone can withstand extreme temperatures, hot and cold. Lite stone does not emit any toxic fumes, will last for a lifetime and requires no maintenance.