Buck Expert's synthetic urine scent has an irresistible effect on moose. A reproduction scent of hormones, secretions, pheromones and musk similar to cow-in-heat or bull-in-rut. An innovative product technology without danger of contamination or problems for the game. So effective, even their sense of smell can’t distinguish it from real urine. Infinite shelf life! Legal in states or provinces that ban pure urine.