Coated Paper Superhero Dry Erase Magnets 12 Pack 4" x 3 1/2" Use your own dry erase markers to write messages on these magnets for your classroom! These magnets can be used to write names of those designated for classroom duties or for organizing where things go on the board! Find more classroom supplies on our site! Coated paper. 4" x 3 1/2" (12 Pack)