Designed For All Wide Neck Bottles and Nipples. The Bottle Brush: • Easy twist handle makes cleaning fast and simple. • Large sponge head reaches all internal surfaces of the bottle. • Variable softness sponges maximizes cleaning power without scratching. The Nipple Brush:. • The sponge shape fits inside the nipple. • One simple twist cleans the surface more effectively than a nylon brush. • Soft cleaning action helps maintain the original appearance of the nipple without scratching.