Wild Country 12mm Dyneema Sling However, difficult to produce at the time, combining dyneema and nylon in a weave that was predictable and reliable enough to give the sewability required to make the three sigma target every time 12mm dyneema was first sold in 1999 and was both hailed as radical, as well as unfeasibly thin when first marketed. At only 22 grams a metre its lightness and flexibility was astounding and meant that swapping from 19mm tubular nylon (about 42gms metre) saved nearly 50% of the weight per sling. Due to this superb ratio of weight to performance, and a proven longevity, 12mm Dyneema is now a benchmark in slings and Wild Country produces a full range of slings in 12mm Dyneema.