The strength of the 1 mm thick cord is very high. I made a rosary bracelet over 2 years ago and it is still as strong as the day I made it and I wear it every day. As for the knots, coat the knot with clear nail polish after tying it and it will last forever. I usually smear it, let it dry and do it again just to be sure, then when it's completely dry I trim it with nail scissors to get it closer to the knot. Great product, good price and super strong.
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