Amazon
Pack of 20 12mm diameter x 2mm thick +/-0.1mm tolerance Each magnet's south pole is on the non-adhesive face and the north pole is on the self-adhesive face Convenient super-strong 3M 468 adhesive with easy-peel backing
Pack of 20 12mm diameter x 2mm thick +/-0.1mm tolerance Each magnet's south pole is on the non-adhesive face and the north pole is on the self-adhesive face Convenient super-strong 3M 468 adhesive with easy-peel backing