... , two ribs and three ribs on the top of shell could be done Lock type of back hoop: Turning knob (rachet), ... helmet with V rib with 6 cooling vents on top of the shellMaterialShell-ABSWeight380gAccessoriesFabric tape, buckle, pinlock, ratchetColourRed, Yellow, WhiteSize52- ... trough, provides a good impact resistance. attached with socket of standard accessory. ยท Complete with 30mm accessory slots and 4 ...