Vevor reflective crushed fire glass adds a bright cobalt blue accent to fire pits, fireplaces, and decorative displays. Made from tempered glass derived from quartz sand, it is designed to withstand high heat without cracking, darkening, smoking, or leaving ash behind. The reflective finish helps create a sparkling flame effect during use. It is also easy to clean with a simple water and vinegar rinse. This 10 lb pack is suitable for both indoor and outdoor decorative applications.