Master Barber Combs are genuine 100% Hard Rubber Combs, designed for the Professional Barber. The combs are burr-free and have saw-cut teeth rounded by hand to ensure a smooth, even finish. They will not snag or scratch the scalp, and are resistant to chemicals and high heat exposure. They are designed to be flexible yet stable for perfect control. Made in Germany. The 689 Master Barber Sociate Comb is the least flexible of the Master Barber Combs. The Sociate features half medium teeth and half fine teeth. Teeth length is 5/8" on the tall end tapering to 1/4" on the small end. 7.5"