<https://www.mukama.com/products/tactile-turn-bolt-action-zirconium-pen#product>
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"Precision machined bolt action pen made from zirconium. Limited availability.\nThe unique bolt action mechanism sets this pen apart from the rest. One fluid motion advances and retracts the refill. Both the interior part and the inside surface have been carefully machined to be extra smooth, so the action feels amazingly satisfying.\nZirconium\nZirconium is directly below titanium on the periodic table, so it shares quite a few properties like extreme corrosion resistance, strength, and density. However, Zirconium is hard to work with and fights back on every turn, which is why the availability is limited. But when the pen is finished, the result is stunning and quickly sells out.\nThree sizes available\nYou can choose from 3 different lengths – Standard, Short and Mini. If you wear big gloves, Standard 142 mm model might feel more comfortable. The Short 130 mm model tends to fit better in shirt pockets without sticking out. The Mini 112 mm is perfect for those who like to do more and carry\nQuality you can feel\nTactile Turn pens are known for their CNC precision machined texture - it's where the name comes from. The sutble grooves create tactile feeling which allows you to control the pen exactly the way you want. It won’t bite into your skin but provides just the right amount of grip. The textured surface also disguises and protects the pens from light scratches much better than a smooth surface."
<https://www.mukama.com/products/tactile-turn-bolt-action-zirconium-pen>