Blue Greenhouse polyethylene film with anti-uv 1,ISO 9001:2008 2, ... and good service 3,Good for greenhouse Blue Greenhouse polyethylene film with anti-uv1, Blue color, good for keeping warm ... Anti-dew, anti-dropping 4,Two layer or four layer.5, daytime can get more kind sun ; nighttime can protect ... greenhouse warm Tips : 1, if you buy the film , please using soon ,don't stock long time . 2, ...