This is a resin detail parts set for use with aircraft kits.
A set of replacement resin wheels for 1/48 Navy F-4s. The package says "F-4J/N", however as the J was a thick-winged Phantom and the N was a thin-winged Phantom, that can't be right! Comparing to Eduard's F-4S set reveals these main wheels are thinner, therefore these should be for the B and N? Includes wheels chocks as well.