Contains 0.975% pyrethrums from chrysanthemum flowers to effectively kill & repel flies, mosquitoes, gnats & small flying moths. Size: 6.4 oz kills gnats & small flying moths contains pyrethrums, a botanical insecticide fresh outdoor scent for use in barns, stalls & stables. Released every 15 Min refill contains enough product to work for 30 days for use in the country vet automatic Metered dispenser., Country Vet 34-2050cva Metered Fly Spray, 6.4 Oz