He gave me a massive bar of 6061 aluminum, which I cut into blocks, which you can see two of on the left. Then five rectangular bars in the back. 2 feet of 1"*1" 6061 aluminum square stock (not pictured), a cylinder of Delrin, and a cylinder of polycarbonate, which shares many similarities with acrylic.
I am very excited to start milling with these, and with the extra strength of the materials, I should be able to achieve a lovely finish on the impeller project.