17", Deluxe Thistle Bird Feeder, Patented Twist & Clean Function As Well As The Even Feed Baffle System Keeping Seed At All 3 Perch Levels, With Its Unique Design This Feeder Allows For Up To 50% More Bird Viewing, Rust Free Tops, Perches, Base & Hanger Along With The Stay Clear Polycarbonate Tube, Dishwasher Safe, Lifetime Warranty.