30-1894 Size / Color: 30" / Red Features: -Stabilizing "feet" that keep the ball from rolling when not in use.-Make the "feet" retract into the ball so it can function like any other inflatable exercise ball.-Non-slip surface is ribbed for extra security.-"Under" inflate to give a soft, mushy feel or "over" inflate for a firm, bouncy feel.-Comes in a polybag. Options: -Available in yellow, orange, green and red colors.-Available in several sizes: 18", 22", 26" and 30".