The Gillette 4S Mach3 blades are replacement cartridges designed for the Gillette Mach3 razor, one of Gillette's popular men's shaving systems. Here’s a detailed description:

Key Features:

Triple-Blade Technology – Each cartridge has three high-quality, ultra-sharp blades for a close and smooth shave.

Durability – Designed to last multiple shaves while maintaining sharpness.

Lubrastrip – Enhanced with a lubricating strip (usually blue or green) that releases moisture to help the razor glide smoothly and reduce irritation.

Open-Blade Design – Allows for easy rinsing, preventing clogging from hair and shaving cream.

Precision Trimmer – Some versions include a back trimmer blade for detailing sideburns, mustaches, and hard-to-reach areas.

Pivoting Head – The cartridge attaches to the Mach3 handle, which has a pivoting head for better contouring to facial curves.

Compatibility:

Fits all Gillette Mach3 razors (including Mach3 Turbo handles).

Does not fit Fusion, ProGlide, or other Gillette models.

Packaging:

Typically sold in packs of 4 cartridges (hence "4S").

May include a protective cover for blade storage.

Performance:

Provides a close shave with reduced tug-and-pull compared to older twin-blade razors.

Suitable for sensitive skin due to the Lubrastrip and fine blade spacing.