These prints are made to hold the TBS Tracer antennas. This combo pack comes with a total of 8 minimal 3D prints to secure your antenna in either a horizontal or vertical orientation. You will receive a mirror image of each of the 3D prints so you can optimize your antenna placement on either side of the frame. The 4 mounting styles are a bolt hole horizontal and vertical mount and a standoff horizontal or vertical mount. You can technically mount Tracer antennas to 4 different quads with this combo pack. Printed out TPU and avaialable in a variety of colors. Enjoy!