... -mold technique 2,L size,dull polish 3,33 air vents,high ventilation 4,factory direct price Bicycle Parts(Helmet,33 air ... vents)Name bicycle parts(helmet,33 air vents)Model TK-12P33Color red/white ... , off the shelf Specifications and AdvantagesTUV,CE certification;33 air vents, good ventilateBuilt-in in-mold technique , the cover is very ...