One of the companies tasked with building a wall prototype on the U.S.-Mexico border believes its concrete barrier would give the U.S. government a bigger bang for its buck compared to walls made out of steel.

“We’re one of the largest steel companies in the U.S. for manufacturing steel, and we absolutely would not build a prototype from steel because we do not want our name on that version 15 years from now if it’s wearing out and rusting out, and people are up in arms because you’re spending billions of dollars,” said Fisher Sand and Gravel Company President Tommy Fisher on Tuesday. “We want to be able to say we gave an A-plus infrastructure product, not a D-plus.”