Mach 3 Razor Blades RefillThe blades feature a bend-sensitive design that helps detect the subtle ripples of facial skin, perfect for shaving in hard-to- areas like sideburns, under the nose and in the bikini line. MaterialsThis razor blade uses 3 layers of inductive nano blades. The blades are treated to ensure smooth shaves. The replacement blades feature a dual-layer lubricating strip, that creates more lubrication for a smoother shave. Fast ShavingSoft microfins help to smooth and stretch skin before the razor blades preparing hairs to be cut. The 3layer razor blade is universal, convenient and fast, to meet your needs. Elastic Sensor BladeElastic sensor blade helps to sense subtle undulations of facial skin. Front hinge technology offers greater angular flexibility and a sensor head that adapts to the curve of the face like water. How to UseTo load refill cartridge, push razor handle into a cartridge as it sits in the dispenser until it clicks. Lubrication strip on the will gradually turn white, reminding the need to replace blade. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.