Bi-Office Magnetic Interchangeable Characters and Numbers are a versatile solution to be used with magnetic letterboards, magnetic planners, magnetic whiteboards, or with any other magnetic surface board. Easy to use, these customizable characters easily slide and hold in position, making it the perfect display accessory. The product includes 144 characters (letters, numbers, and symbols) with a 23mm size and will help you transform any regular magnetic surface into a planning, and controlling personalized viscom tool.