Our ice cube tray molds are made of food-grade silicone, which is BPA-free, flexible and elastic, and can be recycled. This is a specially designed ice cube mold that is perfectly compatible with 30oz and 40oz tumbler cups. This mold creates three large ice cubes, ensuring your drinks stay cold for longer periods. The slow-melting feature of these oversized ice cubes ensures your beverage remains undiluted, preserving its original taste and quality. You can experience the perfect sip every time.