For me these blades need to be used in the proper shaver. I used then in my Lord (Merkur Style head) and they were terrible. Used them in my 1968 Knack and 1940 Tech Fat handle and they were fine. It seems that the more aggressive the shaver the worse the shave. The less blade exposure the better for these babies. I do get about 5 shaves out of each blade. At 20 cents per blade that is no real bargain however. I'll stick with my Personna blue labels at 13 cents a blade. I get at least a week of shaves out of them. These are just OK. My pack said Made in Korea so they may possibly be Dorcos.