3-piece set includes the triangular mold and a cover for forming onigiri, the triangular shaped rice ball. My grandmother used to stuff hers with umeboshi (pickled plums). Now I can make the same treat at home with this handy rice mold! Also useful for forming individual portions of rice for dinner. Top-rack dishwasher safe but this item is pretty easy to wash by hand. Measures 2.75" x 2" tall.