This is the Pentel Pocket Brush Pen that uses ink cartridges so it's refillable.

It's available for sale individually, and as a pack which contains two ink cartridges and an empty pen.

The retail price seems to be around US$10. That's quite expensive when compared to the Copic brush pen.

The whole brush pen is light as it's made of plastic. It feels like holding a pencil.

The synthetic bristles for the brush tip looks quite durable. In the picture above, the Pentel waterbrush on the right also uses synthetic bristles.

The cartridge system works like the fountain pen system.

You push the smaller tapered end of the ink cartridge inside the pen to get the ink into the system. The ink cartridge is the disposable type.

The refill cartridge is definitely overpriced. I'll see if I can use a syringe to refill the ink instead of buying new cartridges when it's used. The usual fountain pen reusable suction-type cartridges doesn't work here because the size is different.

After the cartridge is installed, it takes a while for the ink to seep through to the tip.

The photo above shows the Pentel brush pen beside a small tip Copic brush pen. My Copic brush pen tip is worn and can no longer draw a sharp thin line — I just use it to fill black areas now.

In the photo above, the 5 strokes on the left are from the Pentel brush pen, the three on the right are from the Copic brush pen.

The Pentel brush pen with its bristle tip is flexible, capable of creating thin to broad strokes. Much better than Copic brush pen whose strokes are more limited.

The ink is very black, but not totally waterproof. Strangely, when applied with Copic marker, the black doesn't run out. Just make sure the ink is dry first. It drys fast enough.

The downside is the slow flow of ink. You can't work fast with this pen. If you brush across the paper surface even at typical writing speed, you get the dry brush effect (two strokes in the middle in the photo above). I'll try some other ink in the future to see if the flow is better.

There's no bleeding across the other page, at least for the 120gsm paper I'm using.

Considering that it's going to last for a while, the relatively high price doesn't look too bad.

You can read more reviews on Amazon and Blick art materials.

Availability: Amazon (US | UK | DE | FR)