The primary active ingredients in Martin's 82210013 Ready-to-Use Stump Killer are 5.4% Picloram (4-Amino-3,5,6-Trichloropicolinic Acid, Triisopropanolamine Salt) and 20.9% 2,4-Dichlorophenoxyacetic Acid (Triisopropanolamine Salt). These herbicides work together to effectively kill unwanted trees and prevent sprouting.