A Carbon film resistor can be identified by it's markings, there should be between 3-5 colored bands which are used to identify a resistor.
Also size doesn't always matter when it comes to electronics, although with carbon film resistors it does, the longer the piece of carbon film, the more resistance, though it usually doesn't take much.
Here's the link.
**broken link removed**
Note: Look VERY CAREFULLY at the resistor, some colors are difficult to distinguish like blue/green, and violet/blue, I know the last one sounds kind of funky, but one time it took me about 1/2 an hour to decide which one it was, I looked under many different lights, but didn't actually decide until I went out into sunlight (The best to identify colors under, other lights emit a slightly different color, like a yellowish/pale color which can impare your ability to identify some colors) and some of these bands can be under 1mm in size so a magnifying glass may help.