I bought these to replace my lock laces which were a disaster.  These oval laces are a little stretchy but not much.  If they were less stretchy I would give them five stars.  I needed about 47" for my running shoes, so I got the 54" which are a bit long and my tied bows are a little big but acceptable.  Given the stretchiness I probably could have easily gotten away with getting the 45" laces.  I don't know how they'll stand the test of time, but the laces and tips appear to be pretty durable.