Well, the plastic portion of the cartridge may take longer to break down naturally over time than a solid metal blade.
As another said earlier, they only seemed to last longer for me because I stretch out their life because of costs. It's been around 6 years since I last used a cartridge, so things may be different now.
As another said earlier, they only seemed to last longer for me because I stretch out their life because of costs. It's been around 6 years since I last used a cartridge, so things may be different now.