Taylor's True Dry Aged Prime Rib 7 Rib Roast Full Prime Rib (14-16lbs) Taylor's True Dry Aged Prime Rib. We dry age selected USDA Cgoice or higher grade standing ribs of beef on premise. The Roasts are dry-aged a minimum of 20 days in a temperature and humidity controlled environemt ensuring a proper aging. This Dry Age process gives the beef that old fashioned rich flavor that you do not receive from non-aged beef. We believe this to be the most flavorful tender prime rib roast available. All our roasts are cradled and each rib hand tied. All you have to do is cut the strings and carve. This item is perishable and MUST be shipped overnight.