The chef's knife comes in various size blades, depending on the hand size and experience level of the user. For example, the 12 or 10" blade is commonly chosen by men and women who are comfortable using a knife and can control the larger blade. For those just starting to use a knife, the 8" blade is the easiest to use. When purchasing your knife, the most commonly used and practical knife blade is the high carbon, stainless steel blade. The high carbon holds an "edge" or stays sharp and the stainless steel will not rust or pit with use.