Upgrade your delivery service to UPS Ground for an extra $10. When you choose this shipping option in the checkout process, we will send you your empty knife envelope via UPS Ground with all the materials needed for you to send us your dull knives. Pack up your knives in the pre-paid UPS return envelope, and drop it at your local UPS facility or UPS Drop Box location. Once your package is received by our workshop, we will sharpen your knives and return them to you via UPS Ground. When you choose UPS shipping, you can track their progress in real-time, or choose to get proactive notifications.** Proof of Delivery is provided for every shipment.**