Package:2Pc Stone cube Features: Eliminates the ice that melts in your drink Really cool to use and make a fantastic gift! Has no flavor or odor that would effect your drink like normal ice Rounded edges prevent scratching to your favorite glass Completely washable and reusable As stones are all natural, so there might be some color difference/pattern difference Specifications: Material: natural stone Color: as the picture Item size: about 2*2*2cm/ 0.78*0.78*0.78in (+-2mm tolerance as cut by hand), the dark/light gray ones are smaller: about 1.8*1.8*1.8cm/0.71*0.71*0.71in (+-2mm tolerance) Item weight: about 18-22g per stone Usage: Clean the stones, stock them in your freezer for 4 hours above, serve 3 stones to your drink(liquid height no more than 1 stone height, normally 3stones only serve 60ml/2 fl oz liquid), stay for a while and enjoy your cooling drink!