WilborkAmerican Flag - 100% Made in USA - Strong Like Americans Made by Americans: Embroidered Stars - Sewn Stripes 6x10 ft Outdoor Flag

Q: How many mph can this flag hold before breaking?

I don't know mph's but my area does have a lot of wind. I had previously bought a flag from another company (made in China) and it was a piece of junk and wouldn't put it out so I tried the Wilbork which is perfect and has stood up to the high winds and Arizona sun beautifully. It is very well made!