Feather blades are the gold standard for most of the barbers we know, and for good reason. They are that good. However, we only recommend them for experienced wet shavers, as they will cut you good if you're not careful. That is the case with all razor blades, but these more than most.
Fits all standard double-edge razors (5 blades) or changeable-blade straight razor (this will be good for 10 blades, broken in half).