Sport-Specific Essential Oils – Accurate oils formulated to match scent requirements for AKC, UKC, CKC, and NACSW scent work. Long-Lasting Shelf Life – Formulated for reliable scent integrity, even with frequent handling. Fits Leerburg Scent Work Kits – Refill oils fit perfectly in Leerburg scent work cases (sold separately). Complete Refill Options – Choose from AKC, UKC, CKC, or NACSW kits, each with specified oils and extra cotton swabs. Trusted in Scent Training – Developed by Leerburg, experts in scent training products since 2015. Leerburg has been producing and selling scent work training kits since early 2017. We know exactly what essential oils the various sports require (AKC -UKC - CKC - NACSW). What many trainers simply don't know is there are different oils sold by different suppliers using the same names. In addition, some oil supplies sell blended oils using the same names. We took the time to know exactly what oils each dog sport requires.. There is a misunderstanding among sport trainers concerning the shelf life of each oil. The fact is the manufacturer listed shelf life is not accurate for sport dog trainers. Manufacture information is only accurate for oils that are kept in airtight cool containers. That's not how sport dog trainers keep their oils.