For the music lover in all of us, this letter set is a delight. It has many instruments in the design including the violin, the French horn, the harp, the clarinet, cymbals, the flute, and the piano. The set comes with 15 letter sheets and 5 paper envelopes. A sheet measures 7 1/2” tall by 5 5/8” wide. Envelope is 5 3/4” tall and 3 7/8” wide.