What is Tentsuki in Japan?

Tentsuki is a device to make tokoroten noodle. Tokoroten is a summer snack which looks transparent and made from kanten (agar) extracted from seaweeds such as tengusa (agar weed) by boiling. Pressed against this device, tokoroten is shaped into noodles. Flavorings vary from region to region. But usually they are mixture of vinegar, soy sauce, hot pepper, or sesame.