We currently are not offering Flexa-Trak but are redesigning this product. Stay tuned. Below, please see how you may use our Nilo-Jax product as an EXTREME TRESTLE SET. You may use Nilo-Jax with virtually any sort of track, Lego Monorail track, Hotwheels, wooden train track, Darda, Tyco Racecar track, etc.