These are 3D printed clips to go on the bottom of Lionel Fastrack to hold sections together more securely. They are printed in green to make sure it is easy to see.
These clips are for use on sections with a cutout in the bottom of the track (as shown in picture #4). If your track does not have this cutout (as shown in picture #5) you will be unable to use these without modifying your track and adding the cutout.
Because of variations in the thickness of the track these will not work properly on very thin pieces of track and if your track is very thick you may need to file down the clip.
Track pieces are not included.