Hardened and tempered carbon steel.Teeth milled and set.For cutting of metal: 12 teeth/cm, 32 teeth/inch.For cutting of wood: 6 teeth/cm, 15 teeth/inch.-100: 10 bundles of 10 blades in box.-10P: 10 blades in a special package with hanging loop.-5P: Five blades in a special package with hanging loop.Increased comfort.Superior performance, fast cut and increased longevity.Shatterproof