The only synthetic urine and tarsal gland formula. Pre/Post is a powerful attractant for use year round. Formulated to lure all deer, this product is the foundation of our mock scrape system (How to build a better Buck Trap). With no shelf life and no disease spreading concerns or legal restrictions you can and should use Pre/Post to establish and maintain active scrapes and sign post rubs all year. BONUS! For the best opening day results, start your "synthetic scrapes" in spring or summer, and keep it going until the season starts.