I bought the Derby Extra Platinum Stainless DE blades as I am relatively new to DE safety razor blades shaving. This was recommended by my friend as I am a beginner to DE blades and the blades do provide smooth shaving even for me who is new to traditional wet shave. It is�probably about�3-5 shaves per piece of blade. Overall the price of the DE blades are cost effective and the delivery of this product was reasonably�fast.