I used these a few times in the past when drawing illustrations. I didn't use them very often. I've stored them for a long time since then. Some pens haven't been used, but I don't know the effects of aging. I tested all of them, and none ran out of ink. However, there is some blurring, so I think ink refills are necessary. Please purchase after you understand this. The packaging has damage and dirt due to aging. I will clean each pen with alcohol before shipping. Please purchase only if you understand that these are used items. Instant purchase welcome.