Abstract: A robot arm formed of a bundle of adjacent elastomeric tubes supplied independently with fluid pressure to force bending, extension or contraction. The tubes are maintained in parallel alignment by means of spaced apart parallel ribs through which the tubes pass. Parallel, spaced apart, rods extending through the ribs, but fixed at one end, have opposite free ends passing into position sensors. Bending and lengthwise changes in arm position may be sensed by the rods and used to control pressure in individual arms to correct or change arm position.