Food Grade Level Materials: Ice ball maker is made of 100% food grade silicone with BPA free.It is hygienic, non-toxic, and odorless. The silicone and AS lid closed well at the edges. This allows the ball ice cube maker to remain a perfect sphere after being filled with water instead of falling apart. Easy to Release: The bottom of the ice ball maker mold is made of soft silicone material, easy squeeze the bottom to release the ice ball. To release the ice ball easier, you can let the mold stand for one minute to release, after taking out the ice cube maker from the freezer. Extra Large Ice Ball Size: The ice ball maker can make 2.5 inch extra large ice balls, melting more slowly than smaller ice cubes, which allows your drink to retain its flavor without being diluted as quickly. You could put the large ice ball mold in coffee, whiskey, iced tea. Easy to Fill: The water filling spout of the ice mode at the top allows you to fill the mold without dividing the ice mold in half. The transparent PET lid allows you to see the max water level and stop filling in time.