The Mono Graph Shaker Mechanical Pencil from Tombow utilises the "shake mechanism," which advances the lead by shaking the pencil back and forth.
The "shake lock" can be activated by pushing the clip upwards, to stop the lead from coming out while it is shaking from being in your bag when you are traveling.
All with the Tombow guarantee of high-precision writing and erasability.
Winner of the 2014 Good Design Award and the 2016 Red Dot Design Award.
In the first photo, the colours from left to right are: Cherry Blossom Pink, Ice Blue, Cream Yellow, Coral, Mint Green, Lavender.
Other colours also available.