I Heart My Granddog Bone Magnet! Great for cars, trucks, mailboxes or anything magnetic! These bone magnets measure 7" long x 2.25" tall. All our magnets are Screen-printed with long-lasting UV stable inks on a heavy-weight magnetic material. Made in the USA. Heart My Granddog Bone Magnet! Great for cars, trucks, mailboxes or anything magnetic! These bone magnets measure 7" long x 2.25" tall. All our magnets are Screen-printed with long-lasting UV stable inks on a heavy-weight magnetic material. Made in the USA.