Paracord 650 also called paraline 650 is roughly the same size as paracord 400 type II, it is approximately 4mm in diameter. The braided sheath is composed of 32 threads as for paracord 400 type II, its core is also composed of 4 strands. But these strands are made of "puffy" nylon, that is to say that they are larger than those found in paracord, this is to make the rope rounder and more flexible.