The product you're asking about is the Gillette Mach3+ Blade Refills (3-Pack), which is a popular cartridge for the Mach3 razor system.

The "3S" in the name likely refers to a 3-count pack (3S) of the blades. The "Mach3+" is often used interchangeably with the standard Mach3 or a slightly enhanced version of the original Mach3 blades (sometimes also referred to as "Mach3 Turbo" in some regions, or a version with an enhanced comfort strip).

Here are the key features of the Gillette Mach3+ blades:

Key Blade Features

Triple-Blae System: Each cartridge has three blades progressively positioned to cut hair gradually closer with fewer strokes.

Stronger-Than-Steel Blades: The blades are engineered to be stronger than steel and are designed to stay sharp longer than some other disposable razors (like Sensor3).

Long-Lasting Performance: They are typically engineered to deliver up to 15 comfortable shaves per cartridge.

Enhanced Lubrastrip/Comfort Gel Bar: The cartridge includes a lubrication strip that releases soothing ingredients for an excellent glide. In the "Mach3+" and "Turbo" versions, this strip often provides a more advanced or longer-lasting glide/comfort bar compared to the original Mach3. The strip fades to white when an optimal shave is no longer being delivered.