R406       *Team number on bumpers. Team numbers must be displayed and positioned on the Bumpers such that an observer walking around the perimeter of the Robot can unambiguously tell the team’s number from any point of view and meet the following additional criteria:

R401       *Bumpers should protect all corners. Robots are required to use Bumpers to protect all outside corners of the Frame Perimeter. For adequate protection, at least 6 in. (~16 cm) of Bumper must be placed on each side of each outside corner (see Figure 9‑3) and must extend to within ¼ in. (~6 mm) of the Frame Perimeter corner. If a Frame Perimeter side is shorter than 12 in. (~31 cm), that entire FRAME PERIMETER side must be protected by a Bumper (see Figure 9‑4). A round or circular Frame Perimeter, or segment of the Frame Perimeter, is considered to have an infinite number of corners, therefore the entire frame or frame segment must be completely protected by Bumpers.

R408       *Bumper construction. Bumpers must be constructed as follows (see Figure 9‑7):

G104       *Keep your Bumpers together. Bumpers may not fail such that a segment completely detaches, any corner (as defined in R401) of a Robot’s Frame Perimeter is exposed, or the team number or Alliance color are indeterminate.