With a blend of monocrystalline and polycrystalline diamond particles, these hones offer an excellent combination of cutting speed and durability. The monocrystalline particles cut aggressively but round over time through wear, eventually diminishing cutting speed. By contrast, while less durable, polycrystalline diamonds fracture to expose new, sharp cutting edges so that they continue to cut with speed, although with a finer, less aggressive scratch pattern.