Parachute cord (also paracord or 550 cord) is a lightweight nylon rope originally used in the suspension lines of US parachutes during World War II. Once in the field, paratroopers found this cord useful for many other tasks. It is now used as a general purpose utility cord by everyone from fashion to military personnel. This versatile cord was even used by astronauts during STS-82, the eighty-second Space Shuttle mission, to repair the Hubble Space Telescope.

The braided sheath has a high number of interwoven strands for its size, giving it a relatively smooth texture. The all-nylon construction makes paracord fairly elastic.
While the U.S. military has no overall diameter requirements in its specifications, in the field 550 cord typically measures 4 mm in diameter.


US Military issue paracord is specified by MIL-C-5040H in six types: I, IA, II, IIA, III, IV. Types IA and IIA are composed solely of a sheath without a core. Type III, a type commonly found in use, is nominally rated with a minimum breaking strength of 550 pounds, thus the name "550 cord".[citation needed]The US military specification for paracord outlines a number of parameters to which the final product must conform. 

Rampsik offers:

Micro cord: Diameter around 1,18mm. Breaking strenght 40kg.
Type I: Diameter around 1,6mm. Breaking strenght 45kg
Type II: Diameter around 3mm. Breaking strenght 181kg
Type III: Diameter around 4mm. Breaking strenght 249kg
Type IV: Diameter around 4,5mm. Breaking strenght 340kg
Type V: Diameter around 6mm. Breaking strenght 566kg

All cords are made in the USA. Making sure it's tested and safe. All closing mechanisms etc are tested to make sure your pet is safe.