Opti-Force Fly Spray Catalog Animal Health Fly Spray Opti-Force Fly Spray Description 1 % Cypermethrin formula for a long duration without causing dermal reaction For use on horses & ponies RTU fly spray with 14 day weather & sweat resistance Provides repellency & quick knockdown from biting & nuisance flies, gnats & mosquitoes that may transmit West Nile Virus Rates Please contact us for current pricing and availability.
