Giantmicrobes Themed Gift Boxes - Vampire Snacks Vampires may turn into bats and fear daylight. They all crave blood, perhaps for oxygen in the hemoglobin. As you see in these Vampire Snacks GIANTmicrobes, your juicy heart flows with more than just red blood cells. Its also rich with plasma and white blood cells. For all your vampire cravings, enjoy this ghoulish box. Includes these 4 mini microbes: Heart Organ, Plasma, White Blood Cell, Red Blood Cell. Each mini microbe measures 2-4 inches each.