Includes:
Astra Superior Platinum Double Edge Razor Blades (5)
Derby Extra Double Edge Razor Blades (5)
Feather Double Edge Razor Blades (5)
Gillette 7 O'Clock SharpEdge Double Edge Blades (5)
Gillette 7 O'Clock Super Stainless Double Edge Blades (5)
Personna Stainless Steel Double Edge Razor Blades (5)
Treet Platinum Double Edge Blades (5)

We suggest using the blades in this order (increasing sharpness): Derby, Personna, Treet, Gillette, Astra, Feather. No blade is objectively better than the other - the purpose of this pack is to help you find the blade that suits you best. Once you find a blade you like, stick with it until your technique is consistent and reliable.
About 4-6 shaves from a blade is typical. As soon as the edge starts to dull, replace it. It doesn’t matter which side of the blade faces up, and turning it over after a few shaves won’t make any difference.