This is an item of stationery (paper or writing goods), or other small merchandise such as good-luck charms, mascot straps, et cetera.
What a warehouse find! These cloisonne pins with clutch pinbacks were produced by Kaiyodo back in 1996. Mira Kagami and Miharu Tatebayashi from "Tokimeki Memorial" want to go everywhere with you--let 'em ride along on your shirt lapel, coat collar, or messenger bag! Each pin is 3cm of colorful fun, and each one is just the thing to brighten your day!