No two Tornado Acrylics are the same. Each pen's barrel has a unique mixture to make it even more unique. Choose from the marbled umbra, spumoni. sundance. folsom, and the pink. Each barrel is crafted from acrylic rods that are shaped and then polished to a smooth touch. Convert the Tornado into a ballpoinl pen with a Parker style ballpoint refill or choose from black, red. or green rollerball refills.