Authentic Estrus Combo with Secret Musk for Rut HuntsWildlife Research #1 Select Estrus Combo is crafted from authentic whitetail doe urine with estrus secretions for an irresistible scent that is especially effective during the rut. Each combo includes two 1 fl oz amber bottles with a touch of secret musk to enhance drawing power. Authentic whitetail doe urine Contains estrus secretions Especially effective during rut Includes two 1 fl oz bottles Enhanced with secret musk