It writes fine and is refillable. However, you should not open it while it still has ink. Additionally, when you refill it, it has a cap that does not fit perfectly, causing all the ink to spill on the marker's sponge. Nevertheless, it works without leaks.

The best markers for professional use. I have been using them exclusively for 3 years. The only downside is that the ink doesn't last very long, but even if it runs out in the middle of a class, you can replace the cartridge in 30 seconds and you're ready to go. Personally, I have a bottle of ink for the blue one and I refill the cartridge. I use new cartridges for the other colors.

The ink runs out in a week with daily use of 3 hours, in combination with using another color. The print of the writing appears faded compared to, for example, blue or red.

We have been using these markers for 2 years now. Good quality, easy replacement of the refill, and excellent lifespan.

We have been using these markers for 2 years now. Good quality, easy replacement of the refill, and excellent lifespan.

Very good, but it lasts for 1 week when I use it daily for 2 hours on a whiteboard. It has thick writing and I have to hold it slightly sideways for a slightly smaller ink flow. It leaves a lot of residue on the board after erasing, which is somewhat annoying. It doesn't dry out on the marker or the board. Each marker comes with 3 refills, as long as you don't press down on the marker tip. Instead of 2.3mm, it should have been 1.8-2mm

Very useful, especially for students who had to write many times with their own marker on the board due to Covid. The refill is convenient because it doesn't actually break.

I believe it is one of the best brands. However, I cannot figure out how to refill it, so I bought a dozen. There are better ones though, with darker ink.