Magnetic Fidget Knife

磁力解压直跳刀，采用了磁铁作为动力结构，避免了打印片弹性失效问题，且受力可以安全缩回刀刃，避免意外受伤。Magnetic retractable knife，The magnet is used as the dynamic structure to avoid the problem of elastic failure of the printing sheet, and the force can safely retract the blade to avoid accidental injury.需要3个圆形磁铁 8*3mm，小皮筋一个。Need 3 round magnets 8*3mm, a small rubber band.