Knives must be sharp to cut properly, especially kitchen knives. Anyone who's ever used a kitchen knife to "squish" a tomato understands this point very well. Leave the hassles of sharpening behind with ceramic because they come sharp and stay sharp.....almost forever. Whether slicing a tomato or cutting up vegetables or slicing stew meat, you can't beat a ceramic knife and now you can easily make your own ceramic knife. Each blank comes with assembly instructions. Available in white or black and 3 lengths.