Real wasabi is grated with light pressure in a circular motion on an oroshigane grater. The grating surface is made of dried shark skin Stock Photo - Alamy
Sharkskin Wasabi Grater - Gastro Obscura
Wasabi Grater Chojiro - Large 13 cm / Shark Skin | Crafted in Japan – Osara Australia
Buy Shark Skin Wasabi Grater - UK's Best Online Price
Why was shark skin chosen as a wasabi grater? - Quora