The 12" "Stump Thumper" measures 10" in the mold, 12" on the fall. It is a big worm with a thick tail that is really a hybrid between a "C" tail and a "U" tail. It really puts off some serious vibrations under water. You can experiment with your plastic hardness and get more of a finesse presentation, or a serious thump out of this worm.
Purchase the Tail Only mold so you can add a different color tail to your worm.