Manganese bronze putter.
According to the seller this is a "Ping Anser manganese bronze (85068) putter". There, now you know as much as I do. Source:eBay seller fasteddie_2007 Contributor:Theodore Gray Acquired:16 April, 2009 Text Updated:17 April, 2009 Price: $51 Size: 4" Purity: <10%