Metal and Plastic FREE! Soft and bitable food grade silicone, with no risk of damaging your teeth while driving or exercising. Will not interact with minerals like metal straws. Bendable to fit into any water bottle, shaker cup, or sippy cup. Our proprietary design comes in two pieces so you can adjust the length according to your needs. Fits cups up to 10 inches tall. Size: 4.5" x 9" x 0.40". Weight: 2 oz. Pack of 4.