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
Small Shark Skin Wasabi Grater– SushiSushi
Large Shark Skin & Japanese Cedar Wasabi Grater– SushiSushi
Real Shark Skin Wasabi Grater, 67 x 110mm : Amazon.co.uk: Home & Kitchen
Japanese knives | Japanese Grater with Shark Skin for Wasabi [Middle]
Japanese knives | Japanese Grater with Shark Skin for Wasabi [Small]