A looper in a sewing machine makes the stitch together with the needle. A looper can be either made for 1 thread or 2 thread machines. It is also possible to have multiple loopers in a row to make more stitches at the same time (parallel). The advantage of a looper is that unlike a shuttle hook you are not restricted to the size of the bobbin holder for the amount of thread, Rather, the thread is being fed externally on thread cones which can be bought up to 10 kilos. Most common loopers are used in the packaging industry such as closing bulk bags.