I received the box of pens, everything looked great, colors were beautiful and ink easily erased this was too good to last .... Indeed, after 3 days of use (my son is in first grade he only learns to write, so it really has little use these pens) 4 of them, blue, red, green and brown stopped run ... Unable to remove the pen to see if there was more ink or had dried ... I sent emails to the merchant, he said he was sorry, he did not understand and that he would pay me back for more and new .... I therefore strongly recommend the purchase.