Trodat Printy 4912 Self-Inking ID Protection Stamp Impression Area 3/4 x 1-7/8 (18mm x 47 mm). No expensive shredders needed. All Stamps will be in Black color ink unless otherwise specified to us Special characters Pattern that makes any printed information under the pattern unreadable Will not work glossy paper - not appropriate for magazines, catalogs or photographs. Intended to work on non-glossy papers