What does Subscribe to Save or Subscription Eligible mean?

Stonewall Kitchen now has a Subscription Program so you can enjoy recurring shipments of your favorite items while saving 10% with every delivery. You can choose your favorite items to be shipped to you once a month or once every two months. Subscription orders save 10% off the regular price, and quality for free shipping over $50. If your order is under $50, the shipping is a flat rate of $15.