why is a pencil sharpener attracted by a magnet, even though it is made up of plastic?

Its true that a pencil sharpener is made up of plastic, but the blade which helps us to sharpen the pencil is made up of iron or some metal and as metal being a magnetic substance, gets attracted to the magnet.

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A pencil's lead is made up of graphite, which is attracted by a magnet
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it is a pencil sharpener
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Some material of it is made of magnetic material.the blade. so it is attracted to magnet.
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In a sharpner there is a blade which is made up of iron and iron is a magnetic object so a pencil shapner is attracted by the magnet
 
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