This is a letter opener with a built-in strong magnet on the back. Winner of the 2024 Good Design Award. Even with thick envelopes or crushed corners, you can open them stress-free just by passing them through the groove. The blade is made of durable ceramic. It can open approximately 5,000 envelopes. [Materials] Body: ABS + Glass Fiber + POM, Blade: Ceramic, Built-in Magnet [Body Size] H55 x W29 x D15mm I bought this, but I haven't had much opportunity to use it, so I'm selling it to organize my room.