Choose your majors at the end of the campaign! Each major set comes with a Spellbook (2" enamel pin), a Project (2" enamel pin), Homework (1.25" mini enamel pin), and a sticker (2.5 to 3" and waterproof), each of which are unique to your chosen major. 
This pledge level gets you a total of four 2" pins, two mini pins, AND two stickers!