frame/motor protection consists of outer shell and replaceable plastic insert. The plastic part reduces the impact when the bike falls over and slows the bike down when it is sliding. The outer alloy shell is machined and coated. The rounded contour may look like a skid road edges (manhole cover, asphalt hole, etc.) and prevents jamming. The plastic cushion inner part absorbs the impacts and reduces the speed of the vehicle, In case of small crash just replace the plastic insert. Attention: Please order the Crash Pad mounting kits separately.