This mouse pad features the former Denver & Rio Grande Steam Engine no. 463 (K-27, "Mudhen", 2-8-2 Baldwin Locomotive) on the Cumbres & Toltec Scenic Railroad. The check book cover is 6.65" x 3.5". The inside side 1 contains 4 slots to hold id or credit cards and 2 compartments the width of the cover to hold papers or paper money; side 2 contains a compartment the width of the cover to hold your check book paper backing with a plastic cover and a slot about 2.75 inches wide across the side.