Are Spectra® and Dyneema® the same? Both fibers are made from Ultra High Molecular Weight Polyethylene, or UHMWPE. Dyneema® has a slightly different molecular structure than Spectra® and a higher breaking strength in the larger diameters. It displays slightly better wear characteristics in heavy use areas, and has more elasticity than Spectra® 1000. It has a low specific gravity and therefore floats. Also, it is very UV resistant. Dyneema® is made in the USA.