For its 1979 3-D issue, Kellogg's increased the size of the set to 60 cards, but reduced the width of the cards to 1-15/16". Depth stayed the same as in previous years, 3-1/4. The narrower card format seems to have compounded the problem of curling and subsequent cracking of the ribbed plastic surface which helps give the card a 3-D effect. Cards with major cracks can be graded no higher than VG. - 2006 Standard Catalog of Baseball Cards, 15th Edition.