The 7000 Series is a new generation of professional tailoring shears. The blades are made of AUS8Astainless steel (3.7 ? 4 mm. in thickness) and hardened up to 58+/-1 HRC. The shears are elegantly mattfinished and equipped with a patented duplex interlock fastener that prevents the screw from becomingloose. The fastener is also heat treated and hardened up to 45 +/- 1 HRC. The 7000 Series is available in 8different models,Kai 7230 9 inch, Kai 7240 Serated, Kai 7250 Left, 7250 Pro 10 inch, 7280 11 inch Proand 7300 12 inch Professional Shear.A winner of the IF design award 2005.