I brought the material home from work. It's anodized aluminum lighting grade material with a 98% reflevtivity. It comes with a peelable masking to protect the finish until it's ready to be used. We have industrial shears that we use to cut it with, but it's only .020" thick, so you could cut it with hand shears if you want to. A good score with a utility knife also works, but takes a lot of effort and patience.
I attached them with #6 x 1/2" stainless steel marine screws. I didn't want to use anything that was going to corrode. I couldn't find any in the stores though, so I had to order them online.