Although I have never received the item, I believe it is very usefull. As it was taking so much time to arrive, I have asked the extension of Purchase Protection, what was not granted by Seller. After launching a Dispute, it was refunded.
Online store: AliExpress
US $2.55 |New Xiaomi Mijia Youpin Pen ceramic knife utility knife Paper cutter tool knife burin for student-in Smart Remote Control from Consumer Electronics on AliExpress
2.42 USD