Shaker mechanism

Some shaker pencils. Left to right: a Pilot Delful The Shaker, a Pilot Dr. Grip Equilibrium, two Pentel Jolt (0.5mm and 0.7mm), a BIC AI, and an economy unbranded model

With a shaker mechanical pencil it is possible to advance the lead with a rapid shake of the pencil, in addition to the classic push button mechanism; this solution makes it easier to quickly extend the lead without changing the finger grip. Inside the body of the pencil there is a sliding weight (usually in the form of a metal coil) that activates the mechanism to advance the lead at every shake. In some models there is also a feature which prevents the shaker mechanism to dispense the lead when the pencil is in a lock position.

Shaker pencil models

Brand	Model name	Additional Features
Pilot	The Shaker H-1010
Pilot	2020 (in many variations)
Pilot	Dr. Grip (in many variations)	Ergonomic double-layer rubber grip
Pilot	Delful The Shaker	Double-knock mechanism; shake advancement lock when the tip is retracted
Pilot	Opt	Spring loaded clip; available in body patterns which mimic particular materials
Pentel	Jolt
Uni	Alpha Gel Shaka Shaka	Soft and squishy gel grip; shake advancement lock mechanism (deep push top button)
Tombow	Mono Graph	Twist-extendable eraser; shake advancement lock mechanism (push clip)
BIC	AI	Auto advance mechanism; shake advancement lock when the lead sleeve is retracted
Zebra	Tect 2Way	Shake advancement lock mechanism (twist body ring)
Zebra	Z-Grip Plus	Twist-extendable eraser
Muji	Lower Gravity Shaker Mechanical Pencil
Serve	Shake-it	Twist-extendable eraser