The b.box 2-in-1 Bottle Brush and Teat Cleaner is super clever and convenient. The teat brush is cleverly concealed inside the handle so you will always have it on hand. The sponge tip cleans hard to reach places making sure baby's bottles are always kept clean. It has soft nylon bristles. The b.box 2-in-1 Bottle Brush and Teat Cleaner is also ideal for cleaning the b.box Sippy Cup. Made from PP, sponge and nylon. BPA, Phthalates and PVC free.