Inflatable Rubber Cushions...The inflatable rubber ring cushion is ideal for providing increased comfort whilst sitting. The cushion moulds itself to the body contours and can assist in preventing or relieving pressure sores and coccyx problems. The ring can be inflated easily by mouth at anytime and is easily wiped clean. An excellent pressure relief cushion ideal for use in the home or when traveling in a car or coach to smooth out the pressure stress encountered during the journey. It deflates easily when not required reducing storage space. It is available in two sizes, either 16" (40cm) diameter or 18" (45cm) diameter.