i have a really nice rollerball pen that someone gave me a few years back. ink ran out recently, and it said on the refill that i should purchase refills from leedsrefillworld.com or something. i checked the site out but all they got were for bulk orders!! and i only need 2 at the most!! so i searched on amazon a worthy "investment", and i found this. decided to give it a try.. and behold it was perfect!!!! the ink doesn't splotch or skip, leaves a very good impression on paper!! will purchase this again when i run out! now writing isn't such a chore!!