his product chooses excellent PE, EVA resin and imported functional additives, manufactured composite blow molding with three layers coextrusion equipment, has long service life, good drain effect, high transmittance, high temperature resistant, etc. Service life: 12 months, drain duration: 3 months, light transmittance: above 85%, high strength, high toughness, high temperature resistant, avoid acid rain rotten fruit, high yield, improve the grape quality, colour and lustre, push products early maturing.