This is a genuine CYBEX travel system adapter (left and right set / model number 522003779). This is a dedicated car seat adapter for attaching CYBEX child seats (Cloud T / Cloud Z / Aton series, etc.) to the Libelle / Orfeo stroller. You can attach the baby seat while the seat cover of the stroller is still on. I used it a few times a year, and stopped using it as my child grew. I am selling it for those who only need it a few times, like myself.