R103       *ROBOT weight limit. The ROBOT weight must not exceed 115 lbs. (~52 kg). When determining weight, the basic ROBOT structure and all elements of all additional MECHANISMS that might be used in a single configuration of the ROBOT shall be weighed together (see I103).

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

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

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