These are about the size of two cards laid side-by-side and about as thick as two or more cards stacked on top of each other. These are some hearty items. Pictured, I have Vada Pinson and Sam McDowell. The backs look much like the 1970 regular issue cards - same layout, colors, etc.
How about a checklist?
http://www.oldbaseball.com/refs/70super.html