Top Tier 26" Each Side, Bottom Tier 77" Each Side. This canopy fits gazebos that were sold at several big box stores for the past several years, manufactured by SunJoy Industries, model named the Sunjoy Hampshire gazebo. The Sunjoy model numbers of the gazebos this canopy is designed to replace are L-GZ029PST, G-GZ074PST-2, TGZ074, and TGZ029. This is a hexagon (six-sided) gazebo canopy. Dimensional Verification: the outer edge of any one side of the six sides of the canopy measures 77 inches. THIS ITEM IS FOR THE CANOPY ONLY, CURTAIN NETTING NOT INCLUDED. YOU CAN ORDER CURTAIN NETTING ITEM NUMBER LCM437