Let espresso lovers make aromatic, less bitter coffee . Compound Chill is a technique that brightens the flavor by flowing espresso over a metal stone. Making this technique easier than ever to achieve or in a specialty coffee shop. Simply freeze in the freezer for 2-4 hours and place it just below the handle of your espresso cup. Start the coffee machine and let the coffee flow smoothly over the sphere. Also offers a quick chill alternative without waiting or diluting the flavor. Available in three prongs depending on the distance from the brew to the machine . Specifications:B: four prongs Colour:Silver Material:Stainless Steel Package Contents: 1x Coffee Cooler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.