U839 Spare Part Set - Propellers 4pcs and Protecter 1pcs for UDI RC U839 Quadcopter Orange and Black Compatible with UDI RC U839 Nano Quad copter. Super balance and make the quad fly as steady as the the original propellers. Original replacement crash kit parts with high quality,light weight blades. Durable placstic materia and product color: orange and black Package include: 4pcs main blade propellers + 1pcs propeller protector