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I usually get stuff like that from Performance PCs Home Page
I purchased my last ones from performance pcs. They were black and made out of cardboard. They broke when I tried to add my sleeved cables to them. For reference I had purchased these in size A.
I got the same in size B and they seemed fine, had to peel off the brown stickey paper. On the large 24pin ones if you are trying to work the cables after you have them installed you can snap them but otherwise mine have been fine. Seemed to be plastic to me.
You can get them in different colors.