Our Heirloom Gold New Generation Feeders continue the tradition. Beautiful enough to be appreciated by future generations of Droll Yankees feeders. Over time the finish on Heirloom Gold Feeders will develop a natural patina. This change will enhance the beauty and individuality of each feeder. Stainless steel mesh is correct size for shelled peanuts or peanut mixes that attract woodpeckers or for black oil sunflower. Squirrels find it agonizingly frustrating.