Here's a quick video on how to package your blades for shipping.  In the example we used a Priority mail envelope, but securing them is needed for whatever you ship them in, padded envelopes, boxes, etc. If not secured like in the video, they can cut a hole in the side of the package from being flung around on high speed sorters and conveyor belts used by the shipping location. Lots of customers over the years have lost their steel, but none who secured them to the inside wall of the package have ever lost a set.