Who'd have thought it? A fibre tip pen that's refillable with an international standard ink cartridge? That would be a Yookers. Oh, and you can replace the nib sections too!

All you need do is select the Yookers pen that takes your fancy, and if you want something other than a 1.0mm tip, you can customise it with the tip size of choice before selecting pretty much any colour of ink you like, from many different brands.

The Gaia is delightfully chunky, with a clear window in the barrel so you can see what's going on inside. The barrel unscrews so that you can fit the ink cartridge, but this is also all that's needed to swap in a different-sized nib section. The pocket clip is also on the generous side, and the cap can be securely screwed on.

It's fitted with a robust 1.0mm tip, the shaft of which is protected by a steel sheath, and is supplied with an ink cartridge. It will also take a converter for use with bottled ink.