The pallium dates back to the 4th century, according to the Catholic Church. Modern pallia are two-inch wide circular bands worn around the neck, breast and shoulders. The bands are made from blessed lamb wool, to symbolize the archbishop's role as a shepherd, according to the Catholic Church.Two pendants about two inches wide and 12 inches long hang from them, one in front and one behind.Only the Pope and metropolitan archbishops can wear a pallium. Aymond will wear his only on specified feasts such as Christmas.
Video of the Pallium Mass can be found here (this is part 2 of the Mass where the Pallium are conferred).