Koji Hara makes custom hand-made knives of the highest quality. He primarily uses a powdered stainless steel known as Cowry-Y, made by Daido Steel in Japan, for his blades. It holds an excellent cutting edge and polishes to a high mirror finish. Although one of the drawbacks of powdered steel is its weakness towards lateral impact, this can be corrected through proper heat-treating. Koji also makes knives featuring ATS-34, D-2, 440C and other steel blades, based on customer preference. His preferred method of making blades is via stock removal. A folder specialist, he often carves the handle material into a terraced landscape to feature his classic "Airstep" design.