The big black dog (aka Sirius Black) and Scabbers the rat (aka Peter Pettigrew) having it out! 
 
Based on an original drawing by Jane Mount. She says: "With the Book Pins, I'm trying to capture the essence of a book in less than an inch square."
 
This badge is a hard enamel lapel pin with raised gold-plated outlines. It's about 1 inch tall by 0.75 inches wide, and attaches to your clothing with a black rubber clutch. It ships pinned to a small cardboard plaque in a cellophane envelope.