It is very sturdy metal. I may buy another and the matching hanging shelves. Listen ladies if you have heels, don?t waste your money! One time I had to retrace my steps all the way back to my car to find it. Anyway, I reached out to customer service and they were extremely responsive and promptly sent out some rubber strips. I didnt matter if it was full, empty, loaded in front, or loaded in back, our Sears hard case car topper bounced on the front bar. Its max 6" long from end to end, so if you want to use the cord that comes with them you need to charge them using a plug just above a counter or table if you dont want them on the floor. The straps and buckles have held up as well. Es hört sich ja so akzeptabel an, aber mitunter weiteren Fehlversuchen die beiden Signale aneinander vorbei zu schmuggeln, werde ich die Kopfhörer wohl wieder zurück schicken. My feet really started to come out from me while wearing these, and Ive not had issues wearing other shoes at all.