H-D® Heavy Metal The H-D® Heavy Metal dart is made of just that - heavy metal. Unlike other metals, brass, aluminum, steel, or nickel silver, tungsten is an extremely dense material and is used because of its high weight to volume ratio, providing a heavier dart with a smaller mass. This heavy metal is used in dart production to provide slimmer darts, allowing for tighter grouping and higher scores. These premium darts are made of 90% tungsten and are packaged in our jewelry-styled Ultra carrying case. Whether you are a casual player or tournament tested, the H-D® Heavy Metal Darts are proven winners.