Helen's Asian Kitchen's natural 4 Bamboo Dim Steamer set of 2 with Lids is handmade and securely assembled with bamboo pegs and bamboo lacing. The small steamer baskets can be used as individual serving pieces right at the table. Unlike wood, bamboo is a grass, so it's a renewable and sustainable resource. A bamboo steamer is designed to sit over another pot containing boiling water. As the water boils, the steam enters the steamer through the open slats in the bottom and is contained in the steamer by the lid. The bamboo steamer absorbs any condensation, keeping water from dripping back onto the food. When heated, it forms a hot container and, with the cover in place, can keep food warm for up to half an hour. The bamboo steamer is also an attractive serving piece and may be brought right to the table. Foods that are steamed require little or no added oils or fats, and they retain vitamins and minerals and cook quickly and evenly.