This sale is for one brand new Mamiya RZ67 / RB67 fit 77mm front lens cap, suitable for use with all RB67 and RZ67 lenses except a few very large ones like the 75mm shift.
This pinch-type cap is brand new in original sealed packaging. These caps were found during a stock check; personally I prefer the other 77mm caps that I have for sale (https://ianbfoto.com/product/77mm-pinch-lens-cap/) but these protect the lens just as well. Dead cheap to clear.
When they are gone they are gone. If you want a few caps (or other sizes), just ask.