AI: 48.99% dimethylamine salt, 5.59% triethylamine salt and 4.82% dimethylamine salt. Horsepower is a highly concentrated premium liquid amine salt formulation that provides superior control of hard-to-kill weeds in 2, 4-D sensitive markets. The active ingredients for Horsepower, the amine salts of MCPA Triclopyrand Dicambe, work in combination to kill the weed by preventing sugar movement from leaves to roots and by overdosing it with auxin to disrupt the weed's hormonal balance. Horsepower controls dandelions, chickweeds, knotweed, clover, cocklebur and more.