Auto-Advance mechanism

Some auto-advance pencils. Left to right: two different models of Faber-Castell Grip Matic, a Faber-Castell Poly Matic, a BIC AI, and two Maped Automatic (0.5mm and 0.7mm)

Auto-advance or auto-feed mechanical pencils don't need any action to advance the lead because of their particular mechanism: a spring-loaded sliding sleeve (usually a plastic cone) pushes out more lead every time it is pressed and released from the paper. In order to work, it is required to write with a very little amount of lead coming outside the tip, and practically to drag the lead sleeve on the paper. Most of the time these pencils are also provided with a push button mechanism, and can be used in the classical way.

Examples of auto-advance pencils that are not provided with a push button mechanism. Top to bottom: a Papermate Advancer, a Fila Temagraph Automatic, and a M&G Comrade

Auto-advance pencil models

Brand	Model name	Additional Features
Ohto	Auto Sharp
Ohto	Horizon	Double-knock mechanism with side button to retract the tip; metal body
Faber-Castell	Grip Matic
Faber-Castell	Poly Matic	Twist-extendable eraser
Maped	Automatic
BIC	AI	Shaker mechanism with lead lock when the lead sleeve is retracted
Pilot	Automac	Double-knock mechanism; metal body
Pentel	Orenznero	Orenz system to prevent lead breakage; also available in super-thin 0.2mm lead size (as for the Orenz family)
Papermate	Auto Advance
Papermate	Advancer	Auto-advancement only; disposable pencil (not refillable)
Fila	Temagraph Automatic	Auto-advancement only
M&G	Comrade	Auto-advancement only; side button to retract the lead
Dixon Ticonderoga	Sensematic+	Auto-advancement only
Magic House	Autolead Pencil	Auto-advancement only
Eberhard Faber	EFAmatic	Auto-advancement only