The Hikaru Ceramic Knife and peeler are made from zirconium oxide also known as Zirconia, the second hardest material after diamonds. Hikaru ceramic knives are much stronger than steel and titanium knives while weighing less than half of other knives. Ceramic knives will never rust, as they are impervious to the food acids which discolor steel blade knives. Unlike steel blades, ceramic blades will not transfer metal ions to food, nor corrode from acids or oils in fruits and vegetables, maintaining the fresh of the food. They are the perfect culinary tool for slicing and cutting through boneless meat, vegetables, and fruits.