It would be easier to help if you would tell us what airplane you're working on.

If it's instructions call for regular servos, then it might be a 2m or standard, but who knows for sure. Based on the standard size suggestion, Hitec's Mighty Mini 225 is an excellent choice for most 2m/standard airplanes. It's under an ounce in weight, whereas most standard servos are usually just a bit over 1.5oz. And it is as strong as most standards.