The Bambu Lab 0.4mm Hardened Steel Hotend Nozzle is a high-quality replacement part designed specifically for the A1 Series 3D printers. Made from durable hardened steel, this black nozzle is compatible with 1.75mm filament and is sold as a single unit. The Bambu Hotend is known for its reliability and performance, making it a popular choice among 3D printing enthusiasts looking to upgrade or repair their printers. Designed and manufactured in China, this hotend nozzle is a crucial component for achieving precise and consistent results in your 3D printing projects.