I use Schmetz or Organ needles in my machines. For piecing with Aurafil thread, I use 8012 Microtex needles. I always use Microtex needles. I fin them far superior to universal needles for most applications. I was told that they are sharper than universal needles and so pierce the fabric better. Whatever the reason, I like them! Needle size needs to be matched to your thread size for the best result. Schmetz has a guide on their website as to which needles and sizes to use with which fabrics and thread. Very handy!