ORIGINAL: SCOTT42
Ok, here is a little more info. They are Hitec ball bearing, HS-700BB is the servo number, and here is a pic of what Ive got and I have a total of 4 of them in this aircraft. The wingspan is 8' and it is a scratch build cherokee.
This page
http://www.servodatabase.com/servo/hitec/hs-700bb shows the specs for your servo. And if you need to replace one, ServoCity says use this one:
http://servocity.com/html/hs-755hb_1_4_scale.html