Product Details Pack lasts up to 15 mos (Based on average days' use per cartridge). Lubricating strip. Advanced pivoting head (vs. Gillette CustomPlus/Sensor2 Disposable). Superior cartridge geometry (vs. Gillette CustomPlus/Sensor2 Disposable). Microfin skin guard. Individually spring mounted blades. Nano-thin blades. Gillette. The best a man can get. All Mach3 cartridges can be used on all Mach3 razors. Comments? 1-800-Gillette; www.Gillette.com.