The 4 Key Rookie (RC) Stickers are Auston Matthews, Patrik Laine, Matthew Tkachuk and Jake Guentzel. This massive set has 509 stickers in it with a record 173 special print foil chase stickers included. There are 2 versions of the album made for this series. One version features Canadian players and the other features American players (with 2 superstar Canadian players in Mcdavid and Matthews). Each sticker measures 4.9 X 6.9 cm (1.9 X 2.75 inches) which stays consistent with the 1980's size of sticker.