Made of high-quality food-grade organic silicon. The product is made of BPA-free soft silicone. Make 2 large 2.35 inch transparent hockey pucks at a time. Just put the silicone ice cube tray into warm tap water to freeze for 18-24 hours, with good performance, convenience and durability. With a non-stick design, the disc can be taken out of the shape. The service life of the transparent ice hockey machine is much longer than that of the standard ice tray, and it can serve you for many years. Our crystal hockey pucks are of very good quality, if you have any questions, please contact us to guarantee a 100% replacement or refund!