... is its waterproofness 2- Another feature: anti-againg 1- aluminum windows wool pile with silicon's distinct feature is its waterproofness2 ... "(2.8mm) up to .701"(17.8mm).More detailsProduct NameAluminum windows wool pile with siliconSize5*6 6*6 7*5 etc ... .MaterilPP BCF yarn, FDY yarnUsageAluminum or PVC windows and doors; sliding doorsColorGrey, black, white, beige,brown,etcPackage150 - 500M ...