As of 2016, popular block ice molds include Freshware's Large 12.5-inch Silicone Mold and Tovolo's King Cube Ice Tray, according to the customer reviews on Amazon.com. Both molds are made of 100-percent food-grade silicon, which is a flexible, non-stick material that is safe for the freezer, oven, microwave and dishwasher.
Freshware's Large 12.5-inch Silicone Mold is rectangular and features a molded-in design of wavy lines on its bottom. Tovolo's King Cube Ice Tray creates six 2-inch square blocks. The large size of the ice blocks it creates reduces the rate of dilution when the ice blocks are used to chill drinks. People can also use the tray to freeze single servings of juice or sauce.