OptiMA Large 24" x 36" Monthly Dry Erase Calendar Wall Mounted with Installation Kit. Made in the USA! Non-magnetic dry erase board made in U.S.A. Contemporary design - no clumsy frame Ghost free dry erase writing surface for damp or dry erase markers 24" x 36" x 1/8" Hardboard construction. Installation holes are Pre-Drilled Concealed installation hardware kit. Mounting screws are covered by plastic snap on cap.