R403       *BUMPER extension limit. BUMPERS must not extend more than 4 in. (~101 mm) from the ROBOT PERIMETER.

R407       *BUMPERS shouldn’t be wedges. BUMPERS must not act as wedges when interacting with other BUMPERS.

R404       *BUMPERS must be soft. Hard parts of BUMPERS must not extend more than 1 ¼ in. (~31 mm) from the ROBOT PERIMETER. Only padding (per R402-A), cover (per R402-C, including any coatings or markings), and soft fasteners used to secure padding or cover are permitted beyond this limit. Padding must extend at least 2 in. (~51 mm) beyond any hard parts of the BUMPER.

R410       *BUMPERS must come off. BUMPERS must be designed for installation and removal to facilitate inspection and weighing.