thomasw_
Well-known
I don't have any photos of my ZI's lugs and I cannot say what material they are made of, but mine wore down crazy fast. After just 500 or so rolls, the front edges of the lugs wore down to the point that they are now a sharp edge. So, now I use it without any strap at all: metal rings will wear it further and the threads of Gordy's straps will cut themselves on it in no time. This is one area where I was extremely disappointed with my ZI.
Apparently the lugs are improved on the recent ZIs along with the stability of the ZI RF's alignment.