PRO addresses the conservatives among us with their PLT stem. The shape of the main tube is somewhere between round and hexagonal, a way to get a little more stiffness in the stem while keeping a traditional look and minimizing weight. The handlebar clamp is for the modern minimalists, with two small, separate clamps -- one for the left side, one for the right.
Where this stem is most traditional is in the flip-flop design. It comes in a +/- six degrees. The +/- 6 degree design ranges from 80-130mm in 10mm increments.
The Pro PLT Stem is anodized black and has a handlebar clamp that is designed for 31.8mm handlebars. The steerer tube clamp is built for 1-1/8" steerers, but a reducer shim is included for those who want to use the stem with 1" steerer tubes. The bolts are stainless steel.