XIKAR's Xi series of cutters are world renowned. So when Xikar proudly introduces a cutter without the iconic "teardrop" shape, you can rest assured the Ultra has passed their strict tests for sharpness, quality & style. A 70 ring gauge and as thin as a few credit cards, (only 3.5mm thin!) the Ultra will fit any occasion. As useful as any Xi cutter, you'll never forget it rests your pocket or wallet. "Should you ever (lifetime guarantee) want your blades sharpened, simply return the cutter to Xikar and they'll sharpen the blades and return it to you."