Poly is recommended because you need the extra strength for the high speed running. I run Poly on all my machines. Plus it does not bleach. Anand Anand brings up a question that's been in the back of my mind ever since we received our Amayas. We've been running poly threads pretty steadily for their strength, but our customers like the sheen of rayon. For the Amayas, what is the best type of thread to use for the cleanest looking embroidery but also having the least thread breaks possible - Poly or Rayon. Kip Biddle, partner Brookside Designs 10255 Poags Hole Road Dansville, New York 14437 Tel: 585-335-6162 Toll Free: 1-888-335-6162 Fax: 585-335-8150 email: kip@xxxxxxxxxxxxxxxxxxxx web: www.brooksidedesigns.com