In my mind, one of the coolest inserts of the year are the 2013 Home Town Heroes Baseball Sports Disc. They are approximately 1.5" in diameter and feature your favorite players using "Sportsflics" style technology.
You would hold the disc and move it back and forth in order to see multiple images. See the Dodgers' cards below.
Sports Discs Inserts
#13 Matt Kemp #19 Clayton Kershaw
#43 Bill Buckner #44 Tommy Lasorda
#54 Yasiel Puig #60 Hyun-Jin Ryu
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