The monthly planner is ideal for anyone who wants the big picture and rarely sets up more than a few meetings per day. This is a perfect tool to remind you or appointments, trips, birthday and other Key dates. Hard cover, Twin-wire planners. Our patented CoilPro planners combine the flexibility of a Twin-wire book with the durability of a hard cover. CoilPro planners are also available in a variety of sizes in daily, weekly and monthly formats.