They are sometimes sold under the name Pilot Precise. The tip size comes in extra fine of 0.5 and the fine of 0.7.
These are my two pens. The wear and tear you see is from sandpaper. I like my pens smooth to touch so I sanded off the surface. And it's easier to see how much ink is left inside. The 0.7 pen has darker plastic so it's more difficult to see what's left inside.
They are meant to be disposable but you can actually refill them. That's how I can be using the same pens for months.
Here are the steps to refilling.
- Use a piece of paper, folded a few times, to cover the plastic part of the nib. It's to protect the soft plastic.
- Use the plier, hold it over the paper which is over the plastic part, pull.
- Refill the pen with ink, either with a syringe, or in my case I refilled with Rotring ink that comes in a bottle with a tapered point for easy insertion into the pen.
- Put the nib part back.
I like the consistent lines from the point nibs. The rolling ball nib is extremely smooth to the surface. You can use them at almost any angles as compared to Rotring Isograph technical pens. They have a huge ink well so you don't have to refill constantly. They are as light as a pencil — I prefer lighter pens. They are cheap.
At the tip size of 0.5 and 0.7, I prefer them over the Rotring Isograph.
Do not mistake them for the Pilot V5 & V7 Retractable Rolling Ball Pens. I've tried refilling them and it seems to clog. Anyway, the simple Pilot Tec-point is easier to refill with no problems for a long time.
I've also refilled the Pilot VPen. Works well. But since it produces uniform lines also, I prefer the Tec-point.
Rotring Ink comes in small 23ml bottles, and in 250ml bottles. The big bottle is for refilling small bottles.