This is a MARK5 5inch 225mm FPV Carbon Fiber Frame blue.

A drone frame has two main parts: the body and the arms. The body houses and protects your electronic components including flight controller, 4in1 ESC, FPV camera, VTX etc. Typically it consists of a bottom plate, top plate and some standoffs in between to hold them together. The arms are for installing the motors on.
7075 aluminum alloy side plate, new visual effect, durable, effectively protect the FPV lens.Wide X-arm design, stable and flexible flight attitude.The video transmission installation holes are compatible with the DJI air Unit vista and analog video transmission.
Compatible with lenses with a width of 19-20MM, you can directly install the original DJI lens.Compatible with 16 x 16MM and 19 x 19MM motor mounting holes. The shock-absorbing design of the frame, the stable operation of the whole machine, and the safe operation environment of the electronic system.TPU base, you can install Go-pro cameras, and can also install cameras such as Go-pro 8.

Features:

1. Highly Durable, Strong material
2. Lightweight
3. Easy to assemble
4. Best for your Drone DIY build

Specifications:

1. Product: Drone Frame Kit
2. Material: Carbon Fiber
3. Wheelbase: 225mm
   
4. Other plate thickness: 2.5mm/2mm
   
5. Arm thickness: 5.0mm
   
6. Flight control installation hole: 30.5 x 30.5mm
   
7. Image transmission installation hole: 30.5 x 30.5mm / 20 x 20mm
   
8. Motor mounting hole: 16 x 16mm
   
9. Lens size: 19-20mm
   
10. Suitable for propeller size: 5 inch propeller
11. wight : about 210g

Packages Includes:

1 x MARK5 5inch 225mm FPV Carbon Fiber Frame blue