Un projet signé Kickstarter:

A titanium pen with unique helical bolt-action and a minimalist design

When designing Tipe we set out to make a pen that would last a lifetime, but work in a way no other pen does. Tipe operates using a novel take on the bolt action style of pens by employing two helical grooves precisely machined into the pen clip, instead of a single linear groove like other bolt action pens.  This unique function gives Tipe a sharp, modern look, as well as added durability and improved functionality.

 

-- https://www.kickstarter.com/projects/thetinmill/tipe/