What do you do when they have wrecked their straw from their Tippy up Cup by biting it (or any other way they can think of damaging it!) – you buy the TUM TIUM Straws and Brush Set. With 2 spare straws specially designed for the cup with the weighted end like the original and also a brush to facilitate easier cleaning, this is an ideal extra purchase when you buy the cup. The straw is safe to go in the dishwasher but don’t put it in the microwave as it has metal parts inside the weighted end. It is BPA and Phthalate free so no need to worry about what it’s made from.