You get an original Nikon rubber eyecup. This screws into the viewfinder on cameras like the Nikon F, F2 and Nikkormats.  No rubber rot. Good condition.      

I am including a +1 diopter (for slightly farsighted) which must be used to allow for the eyecup to be screwed in. If you have the original eyepiece ring you can use that ring instead of the diopter. 

Free USA shipping. All other buyers pay actual shipping costs. Regards, Darryl