Extremely hard material that is a combination of bamboo and resins. Works best with Becker Blues or harder. Very crisp attack to the sound. The 8" produces an especially nice "crack". These will not dent. You can break them if grossly overplayed, but they will not dent. You can play them with brass mallets.
They're tuned to roughly a minor 6th apart.
10" - A natural
8" - F natural