Notice yr remarks although first time ever anybody question a copper washer. We have delivered as per SEMT drawings !
Pls note that backside of Monel washers have been cleaned from burrs after punching. We have delivered parts in Monel material (original version-black color)
Also , presume you have not tested them in place.
Anyway kindly advise which sizes you need & material ! Surface finish also to be stated Ra or like superfinish like mirror or rough plate etc.
Size must be inner dia. X outerdia.. X thickness