Patented spirals in this nyjer thistle feeder attract more birds. Nine seed ports on this feeder allow more birds to feed at one time. Birds love to perch on the patented spiral and they love to run along the spiral instead of flying to another perch. The lid is a Squirrel-proof patented locking lid. The feeder is easy to hang (looped 150-lb-test hanging wire included and attached) and easy to clean (patent-pending Twist & Clean easy-clean bottom comes completely off for easy cleaning). Lifetime manufacturer's warranty on workmanship and normal wear and tear. Aluminum and stainless steel parts.