Each is 7/8". All carry initials of the group American Student Union. Most of these were likely used at City College of New York. First reads "Mobilize Against War/Armistice Day/Preserve American Democracy/ASU." Back paper by Harris, NYC. Next reads "City College A.S.U." Tiniest bit of tone with oxidized metal reverse. Third reads "Join The A.S.U." Back paper by New York City maker with the initials "A.S.U." inked on it three times. Next is rare button referencing "Tilden High School." Oxidized back but Mint cello. Last reads "Safeguard Our Schools" with tiny "A.S.U." below. Lightly aged back paper from Beacon Products, NYC. Rare items and see next equally rare item.