The Tektro 512AG is a very high quality, dual pivot, long reach brake, 47 to 57mm. They include re-fillable cartridge type brake shoes, barrel adjusters with O-rings, recessed mount, and a cam type quick-release. The finish is polished aluminum. The quality, finish, and performance of these brakes is far above what you would expect for the price. I've seen a some of the best custom frame builders use these on their own bikes. The price is for two, front and rear, brakes. T521$45.00 All images and text copyright Velo Orange, LLC 2006, 2007, 2008.