... 600mm* Product structure: the helmet shell, the buffer layer, to wear devices, masks and protection of the fixed bracket; cover ... , neck protection, etc.* Material: alloy engineering plastics (PC)* Wear devices: solid comfortable to wear, easy escape, can withstand 90kg of tension ... light ≥ 85% (measured 90%)* Puncture-resistant properties: according to GB811-1998 test requirements of 6,8,3, cone does ...