Replace gas logs, can be used in ethanol fireplace, gas fit and fireplace. Made of special glass, not break or crack in high temperature conditions. Features: A. Colorful, Shiny, ClearB. Well polished, smooth and glossy.C. Reflect like crystalD. Fire-resistant, no crack in fireE. Lead-free.Size: 13x10x8mm Fireglass for bio-ethanol fireplace / firepit