Amnesia fishing line is some of the best and well most popular, memory-free monofilament line on the market.  Available in Black and Clear 100 metres spools in 15lb, 20lb, 25lb, 30lb and 40lb breaking strains.
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Amnesia is ideal for leaders and traces but can also be used as a backing line as it does not fall into coils as many other backing lines do, even if it has been on your reel for some time.  It is also said to be less prone to tangling than braided lines.