Key FeaturesPortion Control: Each tray typically has 4 compartments, each holding exactly 1 cup (250ml). Some models include internal fill lines for smaller portions like 1⁄2 cup.Material: Made from food-grade, BPA-free silicone, which remains flexible even when frozen, making it easy to pop out individual cubes.Stability & Lids: Many include a steel-reinforced rim to prevent the tray from flopping when full. The clear lids prevent freezer burn and allow the trays to be stacked.Versatility: Beyond the freezer, high-quality versions are typically dishwasher-safe and oven-safe up to 415°F (212°C) without the lid.