Cool your drink with these large round ice molds! The Houdini Ice Sphere Tray makes 4 ice spheres (1.75"). Don't drink too fast, these spheres melt slowly so you're free to sip. Large spheres melt slowly for minimal dilution, perfect for whiskey. Silicone construction makes for easy ice removal and clean up. Dishwasher safe (Top Rack Only). BPA FreeTo use:Snap top and bottom silicone parts togetherWith holes at the top, fill each sphere with waterPlace in freezer for 24 hoursOnce frozen, carefully remove ice from silicone to enjoyCheers!