If you find the Juliet to be too small, the XX is practically the same model, but the lenses are
much bigger and the ear stems are configured in the 'Hammer' style to allow for bigger head sizes.
The standard X-Metal/Black, an X-Metal/Plasma hybrid called Titanium Oxide (TiO2), and finally
a 24K Gold plated Plasma hybrid.
The Penny's were designed for those with smaller heads. They look a bit funny on anyone else, but
the spring hinge still allows for comfortable wearing. The usual color combos are available in
mostly polished frame arrangements, but an X-Metal/Ruby variant is available as well as a copper
coated model (to play on the name).
The Mars is a funny model and sadly will be discontinued shortly. It was designed by Michael Jordan
and surprisingly has lasted this long. The lens is circular unlike any other model except for Moons (plastic),
and one model is wrapped in leather (which weathers quite fast).
Romeo's were the first X-Metal to be produced and debuted in Mission Impossible II. They were designed to
fit very large heads (Tom Cruise?), and the quality wasn't as refined as the Juliets and later. They too
are being discontinued, but rumors are hopping around about a Romeo 2.0