ealthy, strong back… support for the back - support to find new strength - for a better quality of life. small tools that take the stress off your back - effective and easy. The Dynair Ball cushion ist approved by AGR. The legendary reliable Dynair ball cushion in a Senso version. i.e. one side with Senso knobs, the other side velvety smooth. Size: 33 cm diam., 36 cm diam. Colours: terra, red, green, blue, raspberry, turqoise, black, silver