MNW1040: Features: -Herbicides-For selective control of broadleaf weeds in rangeland and permanent grass pastures-Concentrated herbicide will treat 1/2 - 2/3 acre-Controls Canada thistle, musk thistle, yellow star thistle, knapweed and more in home pastures and non-crop areas-Registered in select states, see Star Thistle Killer above for sale in California. Construction: -Constructed of clopyralid. Dimensions: -Dimensions: 5" H x 3" W x 2" D.