Onlyfire Fire Glass Cashew for Natural or Propane Fire Pit, Fireplace, or Gas Log Sets, 10-Pound, 1/2-Inch, Cobalt Blue Quality inspected to ensure impeccable performance and elegant appearance. Premium tempering process with consistent jewel-like color throughout. Designed for use with natural or propane gas. Sparkles under the mid day sun or the reflection of an evening fire. Premium tempered fire glass can be used indoors or outdoors as well as decorative in garden,back yard,fish tank,swimming pool,flower pot and so on Will not discolor, melt or deteriorate. will not emit any smoke or odors.Safe and easy to install.