Everything you need for an individual student! This is a real bargain that includes standard size pellet, probe, forced, and bone chart. Great fun and makes a great gift! Standard: What makes this Owl Pellet Essentials 1 Pack Standard essential is the contents. Includes one 1.5 – 2.0 inch barn owl pellet, dissection probes, 1 forceps, a fold out bone chart of the most common prey, a vole, and a free link to the instructor’s guide.