41% Glyphosate, (same Active Ingredient As Roundup.) Takes care of most weeds and grasses. Has a superior surfactant which makes the chemical rain fast quicker and stick better. Gly Star Pro is a post emergent, systemic herbicide with no residual soil activity. It provides quick, broad-spectrum control of most annual and perennial weeds, as well as woody brush and trees. Formulated as a water soluble liquid, Gly Star Pro contains 41% glyphosate and is fully loaded with a 15% specifically formulated surfactant. It provides visible results in two to seven days.