These are a great product for those that want a better looking collar on collard sport/casual shirts that do not have buttons. These are super thin 1/32" or maybe 1/64" yet extremely rigid.  Possible to bend with two hands but would take some effort to do so.  These DO NOT come with the power buttons (magnets) and to be cheap, I used a 5/16" x 1/8" Neodymium Magnet that's N48 that I found on Amazon for about $19 with shipping.  Far cheaper than the Wurking stiff power button.

Overall, no issues applying these - they have a glue-back that you use an iron to stick onto the shirt collar.  So far no issues.