Mike, my set of 4 came in a carton of 4 inner packs - they had "317" stamped on each box and a sheet included that stated these were a matched set of rods precision machined to 317 grams each. Actual measurements with this jewelry scale showed only .3 gram difference between all 4.
Here is a visual record of that measurement. Jerry had started a database of rod weights, but I don't know where we left it -
Regards, Gordon