In About WFDF, Approved Discs and Targets by WFDF

To see technical detail for each of the specifications listed please see Articles  107 and 108 of the WFDF Rulebook. Measures: Disc weights are listed in grams. The rim configuration score is a unique measuring procedure which is described in the test measurements for discs above. The flex rating is listed in kilograms. Abbreviations Diam = Outside Diameter MW = Max. Weight VW = Max. Vintage Weight RCR = Rim Configuration Rating Flex = Flexibility …