The Mark4 13" V3 Pro is a carbon frame suitable for building large 13" long-range drones. The frame has a diagonal motor spacing of 570mm and arms made of 8mm thick carbon, which are even interconnected for extra frame rigidity. The frame is designed for Micro (19mm) size cameras. The camera is mounted in carbon sidewalls to protect it. The frame can accommodate stacks with mounting holes 30,5x30,5mm and 20x20mm. The rear of the frame then has space to accommodate a video transmitter. For the video transmitter, there are mounting holes with spacing 30,5x30,5mm and 20x20mm. The motors can be used with 30mm M4 holes. The frame is designed for use with analog video transmission. However, more experienced drone builders can get digital video transmitters into it without much difficulty.