These ice cube trays are made from durable silicone and allow for easy removal of ice balls and cubes by twisting or pushing from the bottom. Our ice ball maker comes with 6 upgraded spherical ice balls (1.8 in) and a large square ice cube mold that produces 6 cubes (2 in) ideal for chilling various beverages. These trays are made from 100% food grade silicone, ensuring safety and durability. Plus, they are BPA-free and dishwasher safe for convenience.