Tonight I hit my 48th lifetime Ton-80, and it is my 4th for the year (I believe). The darts in use are 25 gram Accudart 301's, which are a mixed material barrel. The front half is tungsten, and the back half is brass. (Like the dart version of a mullet, I guess.) The stem is a short 1/4" threaded aluminum, and the flights are standard dimplex.
By way of comparison, here they are next to a 20 gram tungsten UFO: