TB12 features 12 stitches and a cast aluminum body. This machine is based on an older Janome model. As someone who sews solely on vintage machines because they are metal and not made of plastic like newer models tend to be- these machines are workhorses!
The second machine, TB30 is a bit fancier featuring 30 stitches and one step buttonholes.
These machines are perfect for the DIYer that wants something cooler than your typical sewing adventure!