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I'm looking to purchase a variety of school supplies for an upcoming project. Specifically, I need pens, books, mathematical instruments, school bags, pencils, rubbers, and rubber bands. It would be great if you could provide the detailed specifications, available quantities, and pricing for each of these items. Additionally, I'm interested in understanding your lead times and any bulk purchase discounts you may offer. Quality is crucial, so please include information about your manufacturing processes or certifications that ensure the reliability of your products. Looking forward to your prompt response with the necessary details!