Wildlife Research 405 Special Golden Estrus Whitetail Doe Urine was originally available only to industry insiders. The Special Golden Estrus is the super fresh, premium natural doe urine with estrus secretions that buck"s just can"t resist. Each high-quality amber glass bottle of Special Golden Estrus is labeled with its own serial number and "Use By" date, so you know it"s fresh. In fact, we are so confident that Special Golden Estrus will work for you, we offer a 100% money-back guarantee. If it doesn"t work, send back the bottle and remaining contents for a full refund (not to exceed suggested retail). 4 fluid ounces in an amber glass bottle.