"The Dark Side of the Moon" Roller Ball Pen and Card Case set is a Limited Edition set celebrating the 40th Anniversary of one of the greatest albums in rock history. The set comes packaged in a beautiful custom box that showcases the famous prism on the cover. The pen shows the edition number of the set. The edition is only 1,000 pieces. This is for the last remaining AP editions. AP is "Artists Proof." A fatory sample used for approval purposes. The mid-ring shows "AP/1000." No more will ever be produced.