A steel interior rim provides strength and rigidity for easy filling and mess-free transport to the freezer. Crafted from a high-grade silicone that is food-safe, BPA-free, and lead-free. Makes twelve 1 1/4″ generously sized, perfectly square cubes. Individually molded compartments allow you to pop out a single cube at a time and a slightly raised lip that funnels any extra water into the tray without spilling.