The 8 Greatest Razors For Women Compared to regular ladies shavers, electric shavers for women are more expensive. A foil shaver is because of the speed and vibration of the cutters. It may vibrate 14,000 cycles per minute of performance around. The rate of a rotary shaver doesn't work quite as fast. That is why it can take a few passes uses of shaving using the rotary shaver, the round pattern. The blades of A foil shaver oscillate in a sense just like a buff or the blades of a lawn mower. This means there is a different method to shaving with the foil shaver. The shaver has to be used in a straight line from side to side or up and down.