These blades are designed for the new Gillette razor, the Proglide Power. They allow a better shave following the contour of the skin. Nothing to say about the product, it is perfect: the blades of the razor integrate perfectly and they are new. Price is per cons I find shocking. Nearly 40 8 blade 5 blade! I always had in mind that razor blades were very expensive because they are excessively stolen in supermarkets. There Amazon has no such worries ... but the price is enormous. Finally it may be the price to pay to be soft! In any case, despite the high price, these blades are exceptional and provide a very close shave, even if I'm still far off, wanting to have the perfect shave I press too much ...