MSI Fire Glass LFIRGMARBLU0.5CRU20 0.5” 20 lb Crushed Marine Blue Fire Pit Glass delivers the light, shimmering blue tones of clear, cool waters. Unwind next to your fireplace or fire pit, in your garden, or as you watch water move slowly through a water feature. Perfect for interior and exterior applications, these crushed glass stones are made to withstand intense hear and a range of weather conditions.