This is the go-to file. I've always found that a square file gives you the best lines while shaping. Also, by it being black, I can easily see when the file needs to be replaced.  Don't get me wrong, I love the aesthetic of a white file but being able too see the gunk filling up my file gives me a quick reminder to switch it out. 

• Double Sided - 100/180 Grit
• Reinforced Core