Hand Stamped Item， Good luck penny Packaged on a card with saying "Good luck to you!" Metal: 2015 US Penny Net Weight: About 20 g. Graduation Gift， Class of 2015 Gift This listing is for a one 2015 penny keychain with a hand stamped engraving of the words "Class Of." Because these are hand stamped no two keychains are exactly alike adding to their uniqueness and intrinsic value.