This picture shows three views of a very well made "classic" example of a Gerzean ripple flaked knife. Most of these knives have been reported from Predynastic tombs. They were made by specialized craftsmen. The manufacturing process begins with a preform that was percussion flaked into the desired shape. Then both sides were ground and polished smooth. The smooth surface of one side only was then uniformly removed with parallel pressure flaking. A completed Gerzean knife has a smooth ground surface on one side and a parallel pressure flaked surface on the other. This Gerzean knives measures 8 ¼ inches (22cm) long and 2 3/16 inches (5.5cm) wide.