Ok, not gonna lie— I think this is my favorite letter set DO NOT TELL THE OTHERS. Honestly, though, look at it. It has these super cute hedgehog illustrations with the funniest phrases (“The hedgehog which entered the teacup”) and half of the set is printed on Kraft paper! Plus. It. Has. Stickers. The set comes with 24 letter sheets (12 sheets of 2 designs), 12 paper envelopes (6 envelopes of 2 designs), and a sheet of five stickers. A letter sheet measures 7” tall by 5 1/2” wide. Envelope is 5 3/4” tall and 3 7/8” wide.