[bhumudar]

While what you are saying is indeed true, there is still a frame to be added ( pretty much a a metal rectangular outline of the robot), thus complying with the bold parts of rule

[R33]
Bumpers must be supported by the structure/frame of the Robot (i.e. each end of the Bumper must be rigidly attached to the Frame Perimeter, the gap between the backing material and the frame must not be greater than ¼ in. and no section of Bumper greater than 8 in. may be unsupported). See Figure 4‑7.