You are looking at an Gray & White Agate skull. The skull is 4.0 inches long from front to back. Please notice the back of the skull. This is a stone for grounding and centering the energies of the Root or Base Chakra. Use for self control, grounding, resilience, quiet power, grounding, invisibility, peace and anxiety. Black agate is considered a receiving stones and is used for calming, soothing, inward meditation and reflection. When used for Chakra healing and balancing, Black Agate represents the element earth, and is therefore related to our survival instincts, and to our sense of grounding and connection to our bodies and the physical plane. Ideally, when using black stones at the Root Chakra, they bring us health, prosperity, security, and dynamic presence. PLEASE NOTE: We listed this item at our eBay store as well. If, respectively, one buys it at our eBay store and another one buys it here, buyer who makes the purchase and pays first get it (and we will send full refund to the other buyer). Thanks for your understanding.