Justifly 3% Add-Pack 6x360gram (case with 6 units) JustiFLY Feedthrough in a convenient 360gram add-pack for use on-farm The economically priced 360-gram add-pack treats one 50-lb. bag of free choice mineral Breaks the life cycle of horn fly, stable fly, house fly and face fly for pennies per head/day Reduces animal-handling stress. No withdrawal period. No residues. No resistance issues In average, each add-pack of 360gram (12.7oz) treats 2 animals for 6 months (6 addpacks = 12 animal for 6 month)