Sarasa Clip Gel Ballpoint Pen Snoopy 0.5mm 5-color set I have kept these in storage for over a year after purchasing them. There are some minor scratches on the case if you look closely. Although they were new, I tested them to see if the ink would come out, so I used each color for about one character's worth of writing. Please refrain from purchasing if you are concerned about long-term storage at a private residence.