Finish Line Horse Products Blaster Refill (4-Ounce) Concentrated blend of 7 natural oils in a water soluble base. Includes; Rosemary, Thyme, Calendula, Citronella, Cedarwood. Lemongrass and Tea Tree Oils. Calendula and Rosemary help promote healthy skin for you horse, while Citronella, Cedarwood and Lemongrass are known for other positive benefits for horses.