O-Check™ spiral calendar Item A1813 Size: Size Charts Quantity: 1 2 3 4 5 6 7 8 9 Add to Bag Wishlist Add to Bag Add To Wishlist share: Find In Store Please select a size above. size & fit 3 1/5"H x 11 1/4"W. 54 sheets. Product Details O-Check understands that writers and list makers take their notebooks seriously. This simple calendar is a beautiful example of how this brand's designs emphasize form that follows function. Paper. Import. Item A1813.