Monteverde Capless Gel Ballpoint Refills for Parker Pens - 5 Pack Fine Point Turquoise Ink | Smooth Writing Gel Refills for Office, School & Everyday Use

I bought the turquoise 5 pack.they came in a nondescript plastic zipblock bag, which I didn't care for too much.The barrel diameter is thinner than the rotring refills so I had to put some tape around it to prevent it from moving too much when I'm writing (using rotring 600 pen), which I didn't care for too much either.What bothered me is that I've been using this pen for past 4 days straight, more than 10hours writing with it every day (studying for boards), and I noticed the inconsistency with the flow.Flow was heavier in the first 2 days most of the times with random light flows here and there. It pretty much looked like a medium tip, very wide and bold font. You can tell when the flow is lighter without even looking because it's significant enough where it will create more friction as you write.on Day 3, the font became thinner. it was obvious the flow was getting lighter because the friction increased as well.on day 4, the font is now also less saturated and friction increased even more.honestly this is one of the worst gel refills I've ever used.UPDATE- Literally 5minutes after I wrote the review (still 4th day since I've purchased the product)I uploaded a picture showing the refill ran out.it ran out after 4 days...DO NOT BUY