Model: XW-9 - Quantity: 9 - Color: Grey - Material: Basalt stone - They pass United States FDA (Food and Drug Administration) certification - These 100% pure basalt stone can be used to chill your whiskey scotch vodka white / red wine etc - Each stone is cut by hand and is 7/8" cubed. - Basalt stone has superior thermal mass giving it the natural ability to retain its temperature for extended periods of time. - Basalt stone is non-porous odorless and tasteless. It will not absorb odors - Edges are rounded and basalt stone is softer than glass so they will not damage barware - Please wash stones before first use. - Place stones in freezer for at least two hours. - Then place stones in your glass (recommend 3 stones per 2~3 oz) and pour your whiskey or other chosen spirit over the stones to chill your drink. - Wash and reuse - Packing list: - 9 x Stones - 1 x Special carrying pouch