Don't know if this was posted but what the heck... Model - Unstrung weight, headsize, string pattern, beam Steam 96 - 289g, 96 sq. inch., 16x20, 22mm Steam 99 - 304g, 99 sq. inch., 16x18, 22-24-22mm Steam 99S - 304g, 99 sq. inch., 16x15, 22-24-22mm Steam 105 - 289g, 105sq. inch., 16x19, 24-26-24mm Steam 105S - 289g, 105 sq. inch., 16x15, 24-26-24mm All with AmpliFeel360. Sorry if this was already posted.