Dr. Brown s Wire Cleaning Brush is a multi-purpose lightweight brush easily maneuvers through all Dr. Brown s bottle components especially the Dr. Brown s Internal Vent System for a fully clean and functioning bottle interior. Also use to clean sippy and straw cups. It is a multifunctional cleaning brush that can be used for all Dr. Brown s bottle systems nipples internal parts and silicone pacifiers. It has a nonslip handle for improved comfort and stability.