This is .8mm braided Chinese nylon that is a great media to string on. It has a little stretch but will re-bound once pulled. It is strong and resists cutting and fraying. The cord will melt under a flame or high-heat source so you can heat-seat the ends once tying.
This cord will tie into very secure knots yet it the knots can be un-tied without damaging the cord if you work at it.
I recommend pre-stretching the cord before stringing.