Gordon's 9571127 Pronto Big N' Tuf Weed & Grass Killer, 2.5 GallonTotal heavy duty vegetation killer for unwanted hard to kill grasses and weeds. Use in gravel roads, pathways and along fence rows. Fast acting concentrate that mixes with water. Highlights: Size: 2. 5 Gallon 41 Percent nonselective weed & grass killer Total heavy duty vegetation killer for unwanted hard to kill grasses & weeds Use in gravel roads, pathways & along fence rows Fast acting concentrate that mixes with water Contains 41 percent glyphosate