Plastic Visual ASD Interactive Behavior Rules Board (Picture Communication Symbols) Help manage behavior by providing a tailored visual reference point targeting those behaviors specific to the individual. All symbols are 4.5cm squares, making them easy to see whilst still being a good size to hold and use. All corners are rounded, so no scratches. Made from plastic for great durability. Waterproof, resistant to grease, and cannot be torn. No laminated paper here. Boards and symbols all come with good quality sticky backed Velcro. Easy assembly, simply pop symbols out and stick velcro on. Ready to use in 2 minutes. We use only Mayer Johnson Picture Communication Symbols (used with permission). These are the most commonly used symbols with ASD, meaning they wont need to learn several symbols for the same thing.