The Ice Cube Tray for 30-40 oz Tumbler Cup is a silicone mold that comes in three sizes to fit different cup sizes. It is made of BPA-free silicone material in a green color. The included components are hollow cylinder ice cubes, and the rectangular-shaped tray is easy to clean by hand washing. The brand Fetinar offers a durable and practical solution for creating ice cubes for your drinks.