Rubber stamps are approx. 1/4" tall and are available as un-mounted only, mounting foam is available for diy. These foams are thin mounts (1/16") so are easy to cut letters out with a sharp exacto blade or good scissors.
2-sided adhesive foam for permanent mounting (for wood mounts)
1 side adhesive 1 side cling mount (for use with acrylic mounts)
Also available as a single wood mount (note - wood mount image needs updating as numbers have been added.)