This is a letter opener styled after the Nichirin Swords from Demon Slayer (Kimetsu no Yaiba). I haven't used it as a letter opener; it's been on display. Available for immediate purchase. Nichirin Sword size: Approximately 18cm. Please refer to the images. If you'd like to see any other areas, feel free to comment. This is a used item. Please refrain from purchasing if you are concerned. Please read my profile. Thank you very much.