All of the B+W camera filters 2filter.com sells are mounted in B+W German made brass F-Pro rings only 4mm for 007 clears,New XS-Pro 3mm double rings for more info except the slim B+W cir polarizers they are mounted in an alloy material due to the thinness of the rings.The original B+W slims still offered have no front mounting threads for push button caps.
In markets around the world and here in USA at auction sites,B+W camera filters are being offered in types of mounting ring materials other than the quality brass.The boxes and the filters look the same in the web pictures.When you feel the quality of the German made brass F-Pro mount you know you have a real B+W made in Germany the right one.
