[01/22/2016] 磨刀器，E-PRANCE Knife Sharpener with 3 Stages: Emery, Wolfram Steel, Ceramic Notch for Sharpening Straight Blades from Blunt to Razor Sharp (Black)，現在特價 $7.95 USD。Prime 境內免運費 (學生免費試用Prime 30天)。哪裡買： amazon。