Writing implement that runs out of lead to quickly, usually at a point in an assignment where you need it the most. Requires replacement lead that is quite expensive and is cheaper to buy #2 pencils instead. Other than that it works quite well if you are too lazy to get up and sharpen your pencil.
is usually a plastic cased pen with lead, like a standard pencil, but you can twist it up to make it sharper and replace the leads when they are gone. They tend to break easier than the sturdy standard pencils if you press too hard.
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