The cards in this 66-card set measure 2 1/2" by 3 1/2". The 1981 Kellogg's set witnessed an increase in both the size of the card and the size of the set. For the first time, cards were not packed in cereal packages but available only by mail-in procedure. The offer for the card set was advertised on boxes of Kellogg's Corn Flakes. The complete set could be ordered for $3.50 plus two proofs of purchase. The cards were printed on a different stock than in previous years, presumably to prevent the cracking problem which has plagued all Kellogg's 3-D issues. At the end of the promotion, the remainder of the sets not distributed (to cereal-eaters), were "sold" into the organized hobby, thus creating a situation where the set is relatively plentiful compared to other years of Kellogg's. Cards from this set may be found without the laminated finish that creates the 3D effect.