These are round and flat woven plates(colanders) called “Bon-zaru” in Sado Island’s bamboo work.

Bon-zaru series are available in diameters from 22cm (8.66″) up to 45cm (17.72″)
in diameter with a difference of about 3cm (1.18″).

This page introduces the smaller 5 sizes in the series, 22cm (8.66″) to 34cm (13.39″) in diameter.

Simple yet sturdy, it is the standard for flat colanders.

This colander’s rim is made of a wire core, so there is almost no fluctuation in size.
The flat shape is also less bulky, and several pieces can be stacked for storage.

It goes well with Soba, Sōmen, Udon, Rāmen, or any other noodle dish.
It is also fun to use it as a plate with onigiri (rice balls) or bread on it.

It is also recommended to serve fried or tempura dishes on a sheet of kitchen paper or wax paper.
If oil gets on the surface, use a mild detergent after use, scrub with a scrubbing brush,
rinse well with water, and dry in a well-ventilated place.

A round plate colander that can be used as both a draining colander and a plate, making it versatile.
Please choose the size you prefer.

—Bamboo Crafts, Born and Departing from Sado Island—

According to records, Sado Island in Nīgata Prefecture has been shipping bamboo products off the island for more than 200 years.
Bamboo products were actively made on the island because of the high quality of bamboo suitable for bamboo crafts.

In the old days, many bamboo products were carried on ships
that sailed between Ōsaka and Hokkaidō on the Sea of Japan route.

Since thick bamboo does not grow in Hokkaidō,
many of the bamboo colanders and baskets were made on Sado Island, the ship’s port of call.

The bamboo products made on that Sado Island are characterized by their simple design and durability.
Many of them are for daily use, as if they were used in every Japanese household.