USDA Prime 21 Days Aged Beef Loin Filet Mignon Steak. Avg. weight is 6 oz. per inch thick. The tenderloin runs along either side of the spine, and is usually harvested as two long snake-shaped cuts of beef. The tenderloin (not to be confused with the short loin) is sometimes sold whole. If the short end of the tenderloin is cut into portions before cooking, that portion is known as filet mignon, or the fillet, from the French boneless meat (mignon meaning "small" as true mignons are cut from the smaller tail end of the tenderloin).The fillet is considered to be the most tender cut of beef, and the most expensive. The average steer or heifer provides no more than 4-6 pounds of filet. Because the muscle is non-weight bearing, it receives very little exercise, which makes it tender. Always fresh, never frozen. All our USDA Prime meat is custom cut to order, wrapped in trays with film paper and double wrap in wax paper. Not vacuum pack.( it loses the flavor ) We chill the meat to preserve the freshness for shipping only