Answer:
Sharp and long, flag of the world. What is it?
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find.
Ten men's strength, ten men's length. Ten men can't break it, yet a young boy walks off with it.
If a man carried my burden, he would break his back. I am not rich, but leave silver in my track.
In buckles or lace, they help set the pace. The farther you go, the thinner they grow.
What covers its face with its hands, speaks no language, yet most known what it's saying?