Pasta machines come in manual and electric models. The classic stainless-steel manual machine kneads and cuts freshly made pasta dough. Dough is fed through rollers that adjust from wide to very narrow; a few passes through each width produces dough that is smooth, satiny, and the desired thickness. Another pass through an attachment cuts the dough sheet into strands of predetermined width. Pasta machines are available in a range of sizes. Some electric pasta machines mix the dough and extrude it into different flat and tubular shapes.