Tray is topped with a protective lid to keep freezer odors out and protect cubes. Made from food-grade silicone, this ice tray is BPA-free and dishwasher safe. Each 2.25" cube melts slowly for minimal dilution. Each compartment is made from 100% individually molded silicone, so you can easily pop out a single cube at a time without having to twist and crack the tray.