Sanada Twin Onigiri Mold is a 2 in 1 triangular rice ball mold. Just put rice into the bigger container, close it with the lid and flip it over and push down on the little flap to have your perfectly triangle molded onigiri. Wrap it in seaweed and insert your favorite side dish inside the rice ball. Each mold makes 2.5x2.5"x1" rice balls.