Hard vibe - black cord. L = 15 3/4". With extra heavy heads for improved sound quality and projection, these cord would models are wrapped with a unique synthetic blend which provides improved durability and better weather resistance. The marimba mallets are constructed with birch shafts, while the vibe mallets feature rattan shafts. Field tested and field proven, the superior designs of the Corpsmaster® line developed throughout years of collaboration with the world's finest drum and bugle corp