Suitable for round, triangular, hexagonal and cosmetic pencils

At least 100 pencils must be sharpened

It has a second blade for thick pencils

Has a chip collection tank

It has two durable steel blades 

Smooth and symmetrical cutting

Attractive design

Blue/ red/grey, green/light green, black

 

The pressure forces the end of the pencil into contact with the blade, which remains stationary. As the pencil rotates, the blade pares away the wooden casing of the pencil and sharpens the lead.
Take a utility knife. Hold the pencil firmly in one hand and make sure the tip is pointing away from you. Use slow and certain strokes in an outward direction to sharpen the pencil. You can also use a special carpenter's pencil sharpener.
It really depends on how much you draw and how often you sharpen your pencils. I usually lose my sharpeners before they get dull! A blade in a sharpener should last three to six months with normal use. I found a great manufacturer of sharpeners made in Germany called KUM (pronounced coom).
The blade of a pencil sharpener is made of iron. Iron is a magnetic material. Since magnets can attract objects made of magnetic materials, a pencil sharpener gets attracted towards both poles of a magnet.