30' Side Panels. Fits 10' X 30', 12' X 30' & 20' X 30' Canopies. Each package contains (1)side panel tarp with 3 windows. 12 Mill Thick Waterproof Reinforced corners Uv Resistant Grommets Approximately Every 18' Acid Resistant 3 Play Poly Material 12 MILL THICKNESS VINYL WINDOWS 14 MILL (FREE SHIPPING)