The samegawa grater is made from sharkskin and is used to grate wasabi. This type of grater is chosen due to its ability to produce a superfine paste-like result that is believed to be the only way of producing the requisite flavour from the wasabi root. It is great gift for any sushi lover but can also be put to use on ginger, garlic or horseradish. 

Saunders says:

"You may have tried making your own sushi, now try turning your hand to the wasabi!"

The spec

50 x 80mm. Wood with shark skin. Made in Japan.