Trebleseven TwentyTwelve Calendar The calendar side is based on a 15 column grid across the fullwidth of an A1 sheet — A dual function piece — The A1 calendar can be folded into a 5 column fold out A1 length mailer, which allows for less expensive and easier posting of the calendar. The reverse of the calendar features selected Trebleseven branding/design projects.The Calendar is available from www.trebleseven.com