tekeft pack of 5 sorted teachers self-inking rubber stamps teacher review photosensitive stamps for education tekeft <b> product advantage: <br></b> the one you got is photosensitive stample.it is without ink but the oil can come out automatically.it is dry <br> immediately after the press so the stamp is crystal clear.it can work hundreds.perfect for teacher's classrooms <br> and homework.these kids or teachers stamps are great educational toy to improve kids study. <br> <br> <br> <br> <b> tips: <br></b> it is oiled at the first using maybe but after a few times it is ok .please put some paper or a book under the to be <br>stamped paper so there is a elastic space to press.the stamped surface should be smooth(do not stamp on pointed <br> things),the more smooth the clear stamp you get.<br>