... ventilation ,240g 4,factory direct price Bicycles PartsName 21 Air Vents In-Mold Bicycle HelmetModel TK-12P21Color red,light blue,dark ... the shelf Specifications and Advantages TUV,CE certification;21 air vents, good ventilateBuilt-in in-mold technique , the cover is very ... us directly. Phone: 86-20-3651528 Tel: 86-18244998946Five colors for you choosing BIcycles Parts(21 air vents,in-mold technique)