Feature highlights:High-performance carbon fiber quadcopter frame kits (ZD550 and ZD680) with excellent durability and lightweight design, crafted from 3K full carbon fiber. The ZD550 model features a 550mm diagonal wheelbase, 1.5mm thick main board, and weighs 630±2g, while the ZD680 offers a larger 680mm wheelbase and 3mm bottom plate thickness. Both models include landing skids and support advanced configurations like APM opensource flight control and 4-6S Lipo batteries for superior performance.