The item you're asking about is the Gillette Mach3+ 4S (or Gillette Mach3 4-Pack) which refers to the replacement razor blade cartridges.

Here is a breakdown of the product:

Product: Gillette Mach3+ (or Mach3) Razor Blade Refills.

Count (4S): This indicates a pack containing 4 replacement cartridges/blades.

Blade Technology:

Features 3 stronger-than-steel blades for a close shave.

Includes a Lubrication Strip (often enhanced in the "Mach3+" or "Mach3 Turbo" versions) that glides to protect the skin from redness.

The "Microfin Comfort Skin Guard" gently stretches the skin to prepare the hair for cutting.