RustProof Cleaning Tool The robust PBT build provides a solid, scratchresistant appearance that maintains its look and functionality after extended use, delivering consistent results every time. Hygienic Appearance Care Provides nondamaging scrubbing with protective cleaning, ensuring container interiors are safely maintained with a carefully designed scratchproof brush tip. Precision Cleaning Capability Features a bendable stainless steel core for complex structure maneuvering, enabling flexible adaptability and narrowneck accessibility in baby bottle cleaning tasks without compromising safety or ease of use. Efficient Cleaning System Multiple tools in a 7piece configuration offer adaptable compatibility for different container types, enhanced by a keychain storage system that ensures easy portability and tidy storage. Use scenarios Scenario 1: Everyday cleaning of standard baby bottles with narrow necks, using the bendable core to reach around rims and nipples without scratching surfaces. Scenario 2: Cleaning other containers with varying shapes, such as travel bottles or sippy cups, where the flexible core helps access tight corners. Scenario 3: Onthego use and storage, with the keychain system keeping the set readily accessible in a diaper bag or travel kit.