Enjoy your favorite cocktails without diluting them. One large ice ball melts more slowly than many cubes in a glass for your cocktail, whiskey, scotch, or liquor. Durable silicone won't break or crack over time. HOW TO USE: Place lid onto tray & fill each ball with water until full. Sit flat in freezer for at least 4 hours. Remove silicone form by pulling up on corner flap. Easy to fill, easy to use, and easy to clean. Mad Man, masters of men's gifts.