This is our best-selling bookish pin. We recommend ordering a mix of all 4 colors. "Wyrm," as Medieval history and fantasy fiction readers may know, is Old English for "dragon". We also learned that the old English word for "library" was "bóchord" (book hoard). Book worm/book wyrm, book hoard/dragon hoard. A delightful bookish pun! Great gifts for readers! 1 x 1" hard enamel. Black rubber clasp.