This product is a Bill Mazeroski Pittsburgh Pirates autographed jersey in size XL. The authenticity of the autograph is certified WT91176 by Beckett Authentication Services (BAS). The jersey is an original and has not been reprinted. It is unclear what material the jersey is made of. The product is related to sports memorabilia and falls under the categories of Sports Mem, Cards & Fan Shop, Autographs-Original, and Baseball-MLB.