The brand ecig i use is Starfire and I would say it's not as popular as other companies so it was hard to find out what carts they were. After doing a lot of googling i decided to buy the 501 carts thinking it would fit. That was not the case.... it LOOKED the same with the male thread, but it didn't fit at all. So I am here asking for help because i do not want to buy the wrong carts again... Here are some pictures. The left is the cartridges provided by company and the right is the 501. I took many different angles for you guys. please help!





