Nekigoen Parker Compatible Rollerball Pen Refills - 15 Pack (10 Black + 5 Blue) - 0.7mm Fine Point Smooth Writing Ink Refills for Waterman & Most Standard Size Pens - Perfect for Office, School & Daily Journaling

They seem to write very well. Nice blue color and they fit my Jinhao rollerball pens.Very happy with product and quality...and very good priceI was given a lovely Case xx (knife company) pen. When I needed to replace the ink, the brand on the ink waz Zappo. Amazon does sell Zappo ink, but it was more than I wanted to spend for only two cartridges. After measuring the cartridge, I ordered these and it's perfect! The ink is just as pretty and smooth as the original ink only a beautiful blue instead of black. I'm thrilled! This is now my favorite pen and ink.Writes smoother than the original ink that came in my $150 pen. One stopped writing well after being dropped. Not sure what happened. The second has been writing well daily for months. Good ink.My favorite pen. These can be used as a refill or on thier own. Took me 2 months of intense use at work to empty the first one. Great value for the price! Ink is dark and fries quick. I didn't run into it skipping and writes very smooth.I enjoy this brand. The price is right. This is my second purchase.This is pretty good product for the price and given the giant "Made in China" sticker on the package. A bit darker blue than I expected, but a perfect fit (non-branded pens...I just measured the length of the old refill and shopped for something that fit). A pretty fine point, smooth writing, revived some old pens whose grip and feel I liked but whose ink had run dry.These did not fit any of my three Parker Rollerball pens. To work I had to add a spring to the back of the pen barrel and then the point was wobbly in the screw-on sleeve and sticks out way more than a standard refill. Not sure why they say it works with Parker. It does not. DO NOT purchase for Parker. Sending mine back.The product name states 0.7mm. Turns out to be 0.5mm tip. Disappointed