CRANK IT YOUR WAY! with Hyper Cluster Zombie Stamina/Control Yo-Yo Starter Pack the high performance yo-yo system that?s as unique as you are. Customize with different Skins and Cores to express your style and tailor performance to your personal trick style. To assemble a Hyper Cluster select Skins, choose a Core, and CRANK IT!! Each Skin comes with its own unique, sneaker-fresh artwork and is especially strong in a SPEED, STAMINA, LOOP, WEIGHT, or CONTROL performance category. Every Core is tailored for enhanced performance in a SPEED, STAMINA, or LOOP category and is available in multiple color combinations to match your favorite Skins.