Twinsulator Aluminum Window Twinsulator Window Features Powder Coated Aluminum ExtrusionsThermaProtect Thermally Improved Aluminum Frame and Sash3/4″ Dual Glaze Cardinal LowE 366 Double Strength GlassWarm edge XL Edge SpacerAAMA 2604 Powder Coat Finish for Optimal Finish, Rich Color and Enhanced Performance Window Styles Single Hung Sliding Picture Geometric Most Common Grid Patterns Colonial(COLS) Prairie(PRAS) Continuous Prairie(CPRAS) Double Continuous Prairie(DCPRAS) Interior Colors & Woodgrains Creme White Bronze Black Cherry Light Oak Dark Oak Grid Options Internal - Flat Internal - Contoured View Grid Options (PDF) Opaque Glass Options Rain Glass Obscure Glass Satin Glass