Blown Duck Eggs (20 Pack) (Large, White Soap Wash) Great for painting, decorating, carving, Pynsanky, carving, etc. All duck eggs are laid year round, with the infertile eggs being blown and cleaned at that time. Your choice of eggs cleaned with acid or soap A centering tool is used to center the one 3/16" hole in the large end of the egg Large average 7 3/8" and Jumbo average 7 5/8" in circumference