Some of them do, like the K-Stick Supreme (the rare vape pen that can be used both with cartridges and solid concentrates like wax). Others, like the Rubi, can be used with refillable pods that contain the same material, i.e. oil, as cartridges. If you’re wondering whether a given KandyPens vape can be used with cartridges, check to see if it features a 510 thread. If it does, you’re in good shape.