4 PC SIDE WALLS WITH WINDOWS 12 MILL THICKNESS IS FOR A 10X20 CANOPY (A) HEAVY DUTY TARPS WITH VINYL WINDOWS UV PROTECTION WATER RESISTANT 6 OZ PER SQUARE YARD. 3 PLY POLY MATERIAL. 1200 DENIER FIBERS. 14X14 MESH COUNT PER SQUARE INCH. UV RESISTANT. MILDEW RESISTANT ACID RESISTANT. GROMMETS APPROXIMATELY EVERY 18" FREE SHIPPING WOW!!!!