I love cooking food in kitchen and I am big fan of chef knife. It is good quality of chef knife with inbuilt sharpener in the case. The knife made out of the German stainless steel material that can be placed after using it. It just simply place in the case and keep it up and down one part on the front to sharpen the knife. It also have the push button to remove knife after that. One thing that I have face that my knife was stuck inside the case and it was not coming out. I found that if push back side first while placing inside in case that was happening and sometimes it was hard to sharpen it. The toggle was not going up.