They worked great, I did refill practice before finally throwing my hands in the air. Refusal to refill cartridges that previously always worked. I decided to just buy cartridges and stop saving money. I took my blue, pink, and yellow fingers (a mess from refueling) and started searching Revain to find them. I stumbled across an Aisen product and decided to give it a try, everything went great, they worked fantastic and really weren't much more than refills that never worked. Fully satisfied and will use this brand in the future. Blaine price