1)Usage:for high quality wine,olive oil and some cosmetic 2)Material:plastic 3)Advantage:Great density,can keep the wine fresh 1)Usage:used for high quality wine,olive oil and some cosmetic2)Structure:fit by four parts including a glass ball to keep the wine slow pouring3)Advantage:great density,can keep the wine fresh,are popular in USA,Russia and so on4)Measure:30.5mm Wine pourer fitment