Food safe material: Our ice mold tray is made of food safe PP plastic material, which is nontoxic, odourless and easy to clean. ** Easy to use: You just simply twist, the cube will just pop out. ** Sturdy and stackable tray: Can be stacked, so it won’t spill contents, and allowing stacking multiple trays on top of each other. ** Economical and eco-friendly: Reusable and washable, easy to wash with water. ** Removable lid: Keep out freezer odors and make it easy to stack in your freezer using included lids.