With the Gillette Mach3 + 12 Replacement Blades, you get a supply of replacement blades. You receive 12 blades. Thanks to this, you don't have to buy new ones for a while. A single blade lasts 15 shaves. There's a lubrication strip on the shaver head. Thanks to this, you can glide more smoothly over your skin while shaving. This protects your skin from irritation and redness. The shaver head has 3 thin, sharp shaver foils. With this, you shave every hair 3 times with a single movement. This way, you can smoothly shave your face with precision. After a while, the lubrication strip fades. This indicates that the shaver head needs to be replaced.