plastic. My main complaint is I have a Subaru CrossTrek and the instruction manual that came with the crossbars specified they are for a Subaru Forester, no mention of a Cross Trek. On my walls that had any texture what-so-ever though. I bought the power strip initially for that "just in case" scenario but am using it full-time now, and I just ordered two more. Didnt fit. I sent it back and reordered. Our system uses bluetooth for headsets so this is where these came in handy. I got blistered up pretty good by the edge of the archway and I ordered true to my size in Adidas. It has pouches on the sides for water bottles, and I like this new style of bag with an integrated hook on top to hang your bag on the fence. That is, until now.