100 – 9.75″ X 12.25″ Stayflats Plus White Mailers. Known as our “Diploma Mailer”, colleges and universities across the country have relied on our 5 PSW to send diplomas. The 9-3/4″ x 12-1/4″ size holds most standard size diplomas and awards. Made from durable .028″ CCNB paperboard, it will stand up to the rigors of the mail and keep documents from folding or bending without needing additional packaging or stiffeners. It is also environmentally friendly, made from 100% recycled paperboard with at least 35% Post Consumer Content and is 100% Recyclable.