greater than that of the material of the limbs however it is also conceivable to vulcanise the corrugation entirely in one shape and in this regard to predetermine the shape of the web in rectangular form thus with a planarly extending web fig2 and 3 illustrate a second embodiment of a corrugation bellows 10 fig2 illustrates only two corrugations 12 while fig3 illustrates four corrugations 12 it is understood that a complete corrugation bellows may have any number of corrugations each corrugation 12 preferably has the same form so only one of the corrugations in fig2 is labelled the corrugation 12 has a web 14 interconnecting limbs 16 and 18 the corrugations 12 are interconnected to each other by a frame 20 that joins together the inner ends of adjacent limbs in the illustrated embodiment the web 14 of each corrugation 12 is substantially planar as shown as such the corrugations cooperate to provide a generally planar outer surface 22 when the bellows 10 is in the neutral state as shown in fig2 as shown the limbs 16 and 18 are each substantially parallel and extend a right angles to the web 14 when the bellows in the neutral state as such the limbs 16 and 18 are substantially parallel to each other in the neutral setting also the limb 16 is parallel to and substantially flush with the adjacent limb 24 of the adjacent corrugation the corrugations 12 of the bellows 10 may be constructed in accordance with any of the prior discussion herein in a further embodiment the corrugations each have at least one layer of mesh.