1. Now invisible screens are popular in casement windows. I don't know where you are. The good screen window in Tianjin is about 150, and the general screen window is about 120. If it is lower, it is not recommended to buy it. 3. Now, because the screen window is invisible and the brand is chaotic, many unqualified products are often cheaper in the market. Retail prices like 60 80 are basically low-grade products and have no use value. Buy carefully. 4. If you want simple gauze, it is ordinary glass fiber gauze for 2-4 yuan per square meter. 5. What good brand of glass fiber is used now? There are so many bad brands such as 1.5-2 above 3 yuan.