Big worms just got bigger! Zoom is currently in production of the new Magnum Ol? Monster. This will certainly make a splash with the guys that are heaving big 12 inch worms. The Magnum Ol? Monster easily reaches 12 inches and it?s also beefier around the middle. The circumference of the original Ol? Monster was about one inch. The new magnum version is about an inch and three eighths.