9 out of 10 quilting shops use Organ needles in the machines. They sell other brands but Organ is the top of the line. Superior thread needles are Organ brand. I would suggest reading about needles at Superior website. Lots of info there. I buy them all the same size in bulk at Amazon. Not expensive. I use Schmetz universal for my Featherweight. It is the perfect length for it. Other brand of needles are not the same length and will not give a perfect stitch on the FW. Learn this in every FW class maintenance class I have taken. Each time the instructor had everyone change needles in the FW to Schmetz before even beginning to troubleshoot and repair.