For Scotches, bourbons and liqueurs that don't need watering down, Chillrocks provide a long-lasting chill that won't dilute or compromise taste. They can also used doubled-up in taller glasses, making them perfect for iced-tea, beers and ciders. They're made of food-grade non-toxic gel that freezes in four hours: to use, freeze the Chillball, snap it into the flexible curved clip, and insert into glass. ChillRocks come in a pack of 4 with 8 clips (4 long and 4 short). The balls and clips nest in the smart travel case for compact storage in the freezer. Chillballs: 1.5 round each. Hand-wash chillballs. Clips are dishwasher safe.