I just got my new order of cartridges in from smart fixx along with a black pen style w/ black anodized ring(i currently have thier white pen style & black with chrome ring) I wanted everyone to know that smart fixx has changed the cartridge style and the new cartridges no longer fit right in the white pen style or the black pen style with the chrome ring on the atomizer. The carts are too large to be fully inserted.They do fit fine in the all black pen style with the black anodized ring. I contacted smart fixx about this and they told me that they switched due to the fact that the new carts are individualy wrapped, but that they can send the old style carts that actualy fit. I also found that the new carts doen't taste as good as the old ones, but this could just be me, has anyone else had this issue? For now I'm simply removing the filaments from the new ones and inserting them into my old carts, kinda a pain but it works