Police memorabilia collecting is a hobby involving the collection and trading of law enforcement-related items such as patches, badges, uniforms, equipment, hats, helmets, training manuals, medals, and decommissioned or restored police cars. Memorabilia generally focuses on collecting historical artifacts such as turn-of-the-century screw-based handcuffs, though it can also include collecting modern items, typically those that have been decommissioned.