B-Free of Flies B-Free of Flies contains 0.22% Pyrethrins, and has been especially formulated for use on horses. Used either as a spray or wipe on, this protective coating protects horses against flies and mosquitos, while leaving a high sheen to the hair when brushed out. Simply apply either with a soft cloth or a fine mist spray, one or two ounces per head per day. B-Free of Flies is also a grooming aid and coat conditioner. It contains natural Pyrethrins and leaves no oily residue. Benefits: natural Pyrethrins leaves no oily residue protects horses from flies conditions coat Kills and Repels: stable flies horn flies house flies face flies horse flies deer flies mosquitoes gnats ticks fleas lice Note: Do not exceed 2 oz per horse per day.