GTT patent technology, strong but flexible, high quality zirconia material, 3"-7" blades white/black, ABS TRP colorfule ... to sharpen regularly.Advantages of GTT ceramic knife:SHARP, HEALTHY, FLEXIBLE, EFFICIENT, RUSTLESS-Never leave any metallic taste or smell on ... or meat with bone. Athough GTT ceramic knife is more flexible and can bear higher drop test, but please avoid dropping ...