CODE BLUE PRE-ORBITAL GLAND 2.6 OZ. Code Blue’s Pre-Orbital Gland scent was designed to be used on a licking branch. Bucks will rub their pre-orbital gland, which is located near the eye, onto a licking branch to leave his own unique scent. Pre-orbital gland scent contains a specific pheromone that helps establish dominance in the herd. You can create a licking branch of your own when making a mock scrape or apply the pre-orbital gland scent to an existing licking branch to stimulate a buck’s natural instincts to rub and mark his territory.