If you're looking to sharpen your knife, this is an excellent Japanese combination of whetstones that will get your blade's edge back. 

The stones have a 300 and a 1000 grit surface. Inside the box there is an instruction manual with some useful tips, even for the seasoned sharpeners among us. 

If you are unsure of the correct angle to sharpen your blade at, we also sell a sharpening angle clip.