I have 3 umbrellas %26 every year at least one blows over from wind. I've got 3 stands, 2 metal, 1 plastic over cement %26 they'll all fall victim to the wind in the wrong spot. I bought these hoping the weight of the sand would hold them down. So I tried my weakest base holder first, the plastic over cement %26 used 2 of the canopy weights which did not blow over. We put two on the remain umbrellas %26 added a third “just in case” on the plastic over cement umbrella base. I definitely recommend these outdoor canopy weights for your outdoor umbrellas that fall over in the wind regardless of how heavy a base. I've a very heavy duty flat base, %26 given enough heavy gusts, it too will blow over. These work perfectly, I bought bight blue so they're seen. This product has solved many years of broken umbrellas from blowing over! Very much a “worth it” purchase!