100% BLUE Agave. I make that distinction because there are tequila mixes with green Agave (Mezcal) that are 51% Blue as well. Tequila's main requirement is it being manufactured in Jalisco with Blue Agavé as the main ingredient. They use the piña, or the fruit of the plant, not the leaves, but the leaves are strong fibers and have other uses (like rope).

My ex ran a tourism company and I've been on so many tequila tours...