Heat offers the most promising distance for developing players! After rigorous testing by 20,000 Ace Racers, the Heat has been hailed as a breakthrough for its ability to deliver big distance at slow arm speeds. Heat is a fast, small rimmed distance driver that offers plenty of glide. Discraft's Big Z Collection: BIG stamps, standard molds, in a unique Big Z plastic! Big Z has all the durability of our popular Z line plastic, with a modest pearl quality added. Colors may vary. Please contact us for more specific weight or color requests.