BirthdayExpress Sonic Boom Party Supplies - Empty Favor Boxes (4) Includes (4) empty favor boxes. Made of cardboard and measures 6" x 4" x 3" in size. Add matching tableware, favors, accessories, or a party kit bundle to complete your Sonic themed birthday party. Features classic characters from the SEGA video games such as Sonic, Knuckles, and Tails!