Product Details  Conference Notebook,Superior Notebook,Office Supply  Our finest quality ensures a smooth surface that is a pleasure to write on  Conference Notebook Size: 16K (18.5x25.6 cm), 25K (14.5x20.5 cm), 48K (9.4x16.8cm).  Material: Genuine leather, PU leather, PVC leather, Fabric.  Description: Double-binding thread finish, slot name/business card holders, clear pvc ID card holder, interior pockets, slot SIM card holders and slot Memory card holders, elastic pen loops.  Accessories: Planner pages, plastic ruler(transparent ruler), calculator(solar calculator), gift box, and PVC bag.  All of materials, description, functions, accessories, and colors, are optional.