Large mealworms are the same as our regular mealworms, just bigger. They are 3/4" to 1" long. Grubco's large mealworms will always fall into a constant range in size. After all, mealworms are a living and constantly growing animal. Mealworms will continue to grow and eventually turn to beetles if kept at room temperature or will become dormant if refrigerated. Mealworms will last several months if stored at 40-45 degrees. Grubco mealworms will always arrive well fed, plump, and lively. We guarantee your satisfaction of our mealworms with a no hassle refund or replacement policy. If you are using large mealworms for fishing, they are perfect for a #8 hook or smaller hook.