400 – 6″ X 6″ Stayflats Plus White Mailers. Our 9 PSW is an ideal mailer to send CD/DVDs and eliminate the need for a padded or bubble mailer. The 6″ square size holds CD/DVDs in a paper, paperboard or Tyvek sleeve. Made from .020″ CCNB paperboard, it’s an environmentally friendly way to store and send CD/DVDs. It’s also 400% Recyclable.