Time to restock and upgrade you classroom slide collection? Consider the Classpack of 15 slides. Optically clear and sharp, these slides are carefully prepared and expertly stained to clearly show the specimen. Packed in a sturdy 15 slide box for safe shipping and storage. Each slide is clearly labeled for quick identification. These slide sets are a good choice for classroom use where some rough handling is expected. (Free USPS shipping within the continental USA)