Advantages of steel cord: 1. High tensile strength 2. Pretty fatigue resistant 3. Good impact resistance. First, wrapped at spools, 4000M for each spool Second, 72 spools into one big carton box: 6 layers, and 12 spools each layer. Generally speaking, for one 20' container, the gross weight limit is about 18T, for 40', is about 22T. Since steel cord is a heavy weight product, it is preferrable to use 20' container rather than 40'.