For a sharp but forgiving blades, try the 10 Merkur Double-Edge Safety Razor Blades. 
 
Sharp blades 
Long-lasting sharpness
Blades are individually wrapped in wax-paper
Compatible with modern double edge safety razors including Fendrihan, Merkur, Parker, Edwin Jagger, and more!
Platinum covered stainless steel
1 pack of 10 blades
Made in Germany