Disney Princess 9 oz. Slim Line Sippy Cups make cleaning easier for mom and drinking fun for kids! Moms love the One Piece Lid that is easy to clean. Unlike many other cups, there are no small parts to lose. Not to mention, the cups are dishwasher safe and BPA free. To make life even easier, all of The First Years Slim line cups have interchangeable lids. This means you can keep the cup even when your child has grown out of a sippy cup spout!