Gillette's No. 1 on sensitive skin. Nearly 15% savings per cartridge (Compared to three ProGlide manual 4 ct packs, based on manufacturer's price to the retailer). Fits all Fusion handles. Gillette's Refill Cartridges: Fusion ProGlide: Number of blades 5; Precision trimmer for accurate edging; enhanced lubrastrip (Vs. Mach3 base) with a smooth glide; our most advanced blade coating; Gillette's thinnest, finest blades (First 4 blades). Comments? 1-800-Gillette. www.Gillette.com.