My son and I have been playing with them on some hotwheels tracks! Pretty neat when you have the banks on them to. It works pretty well and fits them perfectly. Just can't build them to high.
And the other cars such as MicroSizers and clones can run through it really well.
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Evo Lancer MS (27mhz)
Subaru WRX MS (49mhz)
Honda Civic SI ZZ (49mhz)
Toyota Supra ZZ (27mhz)
Purple Porsche ZZ (49mhz)