The only real original 550 Paracord type III. The most popular thickness of 4mm is suitable for many applications. For example as ridgeline for your tarp. Thickness 4mm. Core: 7 strands. Tensile force 249 kg.

Specifications: 

Tensile force: 249,5kg 
Colour: Black
Thickness: 4 mm
Core: 7 strands

Paracord 550 Type III 

Paracord is a lightweight nylon core rope with a diameter of 4mm.
The core consists of 7 strands which can be used separately. Paracord is specially made for the U.S. Army and because of its beautiful properties it has become indispensable during outdoor and bushcraft activities.