Repel-X Insecticide and Repellent in a ready-to-use spray formula. Water-based formula kills and repels stable flies, horse flies, face flies, deer flies, house flies, mosquitoes, gnats, chiggers, lice, fleas and ticks. Use Repel-X on horses and their premises. Repel-X contains 0.05% pyrethrins, 0.50% piperonyl butoxide and 0.10% permethrin.