SMOOTHERPRO Ballpoint Pen Refills, 14 Pack for Bolt Action Pen, Compatible with Parker, 0.5mm Fine Point, Black and Blue Ink(PR1408)

Excellent quality.

These refills work great. I have used them in 4 different pens (one actual Parker Pen and a few others that I had received from customers or vendors) they work well in all of them. The ink flows smoothly.

These refills are decent for daily use and abuse. The black are thinner then the blue for some reason. The black are like Fine and the blues are close to medium. Still using them though since they write decent for work and abuse so not bad for the price

Really great refills

Good value for the money. Quality is fantastic

The original ink fills (2) that came with the pen I had ran out after about 2 weeks for the both. On to these, I did have one dud, lasted for a few days then nothing. The rest have been fine.

Pens do write smooth,they have good weight. Only down side the black pen is stiff. It takes a little more strength to open and close the pen. They only been used few times. Only had them a few days. Maybe it will loosen up more.

The blue refills appear to be 0.5mm balls, while the black ones seem like 0.3mm. There are no markings on the box or the cartridges, so I don't have any way to verify those measurements. The blue ones write very smoothly. Black ones are okay. The gel ink flows smoothly and dries quickly.