These glass slides are professionally stained, mounted and individually labeled for observation under the microscope. Set is packed in its own 25 capacity labeled storage box. The Elementary Level set contains 12 different slides: cotton fibers, nylon fibers, corn starch, salt crystal, wool fibers, silk fibers, stem of pumpkin c.s., legs of honey bee, pollen, bird feathers, hydra w.m. and frog blood smear. All three prepared slide sets are pictured but each is sold separately.