These whiskey stones are made of Hi-tech ceramic that can be recycled. Ice melts and it will thin out the whisky. White ice will cool and keep the original flavor. White ice can be recycled. White ice stones cool down the whisky much quicker than regular ice. The tough surface of ceramic whisky stones makes it easy to be cleaned. Laser etch is an available imprint with an extra charge. 2.5" W x 6.25" L x 1.5" H. Imprint Area = 0.5" W x 0.5" H on 1 Side (imprint). Packaging: Gift Box. Please call for multi-colour or multi-position imprint plus the availability of rush delivery.