Known as a protective stone, Obsidian shields you from others negativity. It’s also been known to bring clarity, strength and support during times of adversity and change. Holds approx 450ml of water. Include bonus neoprene water bottle cover. We use Borosilicate glass which is lead free, BPA free and more resistant to thermal shock. Our beautiful CAW Bamboo Crystal Dome Waterbottles feature a bamboo lid and base and a glass dome with slits that allow the water to flow through and be activated by the crystals.