ve a noticeable bump inside, and can do all the plain's socks including small stereo.4. The machine to do double cylinder cover mouth, no socks inside of uneven flowers feel.5. Heeling and knitting with 2 colors & 2 feeds connecting function6. Can do invisible socks.it can make various of socks: 1) plain socks 2) two feeder plain socks 3) ship socks (invisible socks)4)plain tights 5) five toes socks.