The Gillette Mach3 has been one of my favorite of Gillette razors and I, despite my sensitive skin very rare with razor burn and shaving-related skin irritation problems. The Gillette Mach3 Sensitive Gillette provides a further improved blade system that is specifically geared to sensitive skin. I personally like especially the moving blade head, because he makes crucial enjoyable and comfortable shave. The shaving experience and results with the Gillette Mach3 Sensitive correspondingly positive. The 5-pack is enough for me definitely rather longer than the specified 15 weeks (3 weeks / blade). The blades fit in any Mach3 razor. Recommended.