No-see-um netting specifications: Style: NZ 11, Weight (oz./sq. yard): .95+/-15%, Wales (width/inch): 28+ /- 4.5, Courses (length/inch): 43+/-6.5, Thickness: .0078+/-.0015. CHEMICAL-FREE protection against mosquitoes, no-see-ums, gnats, ticks, black flies, sand flies, green heads, wasps, bees, ants, spiders, other harmful insects, garden and crop protection, decorative and utility use.