These are used 10-round factory Glock magazines that were traded in from a police department. Glock magazines have a hardened steel insert encased in high tech polymer. This polymer coating protects the magazine and prevents deformation, even when dropped from a great height.
Price is for one Glock 30 police trade magazine.
Very satisfied. Good value!
I bought 5 mags. No failures to feed, fire, or eject. I’m just waiting for the 13-round mags to come back in stock.