Fast Back Ropes Cobalt 4 Strand Head Rope 31'Fast Back Ropes Cobalt 4 Strand Head Rope 31' The Cobalt is a perfect combination of poly and dyed nylon resulting in a highly durable rope. The Cobalt is medium in diameter and weight and will likely appeal to ropers who prefer more tip weight and less body or bounce. The Cobalt is similar in diameter to the popular Excalibur. 35' Length Lay Options: XXS, XS, S, MS 4 Strand Core Construction Durable Reduced Body, No Bounce Swings consistent in all