Manhattan Toy Wimmer-Ferguson Grasp and Grow Activity Rattle and Teether From Manhattan Toys award winning Wimmer-Ferguson infant collection - the original innovator of black and white developmental toys Multi-sensory grasping teether has rattles to provide auditory stimulation and teach cause and effect The two colorful rings also clack together adding another auditory element, with loops for linking or tieing to strollers or car seats Rattle features high-contrast color and black and white visually stimulating, Wimmer-Ferguson researched graphics 7" long dumb bell shape makes this clutching rattle perfect for little hands to grasp