With the Teamson Home blue fire glass, you can add a touch of glamour to your gas fire pit by adding these Eco friendly and safe Lava Rocks. Made from tempered clear glass and fire-resistant up to 600, these lava rocks will not melt, break or emit smoke. Designed to be used indoor or outdoor with Propane Gas Fire Pits, they are a great replacement for glass logs as these add ambience and create a beautiful shimmer during the day and appear multicoloured at night when the gas fire pit is in use. Perfect to give your firepit a touch of class. These Lava Rocks can also be used in aquariums and for landscaping. Can be easily cleaned with water and vinegar.