Heritage Farms Nyger Thistle Feeder Designed with birds in mind! .... ..Bright yellow top and bottom attracts goldfinches and other song birds. ... ..Heavy duty die cast top and bottom for durability. ... ..Aluminum perch rods can be removed for easy cleaning. ... ..Pic-A-Seed openings allow the use of Nyger thistle or a fine finch mix. ... ..Smaller 2" UV protected tube for less seed spoilage. ... ..This bright yellow Nyger thistle feeder will awaken the goldfinches in your yard! Based on input from our birding friends and confirmed by field tests with actual goldfinches, this feeder does the job!