1. Old Straight Razor. Though I plan eventually to take a whack at making my own blades, I do not presume that this is an easy matter. For the time being I buy them at auctions on ebay
and typically find them in lots of 6 razors. There are many manufacturers whose blades are quite valuable. I tend to stay away from them as they are cost prohibitive, and as well these specimens are usually of greater significance to simply be restored. Check the value of the old razor your grandfather has laying about before you go cracking the scales of a family heirloom.
2.Elk Antler. This one was a shed-horn (i.e. no elk were harmed in the making of this instructable) but collecting them from taxidermists, websites, dog chews, or hunting are also other ways to find them. I choose elk antler because they have a very large diameter, and therefor the end project will show a great deal of antler exterior. It is possible to do this with Whitetail Deer antlers, but only the largest will provide you with a sufficient surface area for the desired effect, and cutting these antlers seems foolhardy to me. One could use a Mule Deer with a thick main beam, or other less common undulate but Elk are in plentiful supply, and their antlers can be found readily. You will need a section that is at least 7" long.
3. Miscellaneous Brass Rod and Tube. These will be used to pin the scales together, and as well will serve as the bushing on which the blade will rotate. I do not specify a size, as each blade is different, and finding the appropriate fit is a bit of an art (read: kicking and cussing).