This anti-slip ice ball mold is made of silicone. New design makes sure it won't fall off. Great for ice making when drinking. 100% quality food grade silicone, does not contain BPA, is FDA approved, environmentally friendly, reusable and durable. It is resistant to high temperatures, flexibility and easy to clean. Simply fill with water, freeze, and remove it from the mold for easy use. We offer customize your own design logo, image or message on the surface.