Hi everyone! Can someone tell me what the fiber material is in the carts that are in the refillable carts for the Joye 510? Is it something I can buy? Hubby and I have been using the Joye 510 e-cigs and love them. True, the refillable carts don't cost that much, but to have to be ordering them over and over is getting to be a pain as it all falls on me, LOL! Hubby goes thru them like there is no tomorrow! We are both somewhat new to this....since the first of the year. Hope someone can help me.