Defender Seed Feeders Are Tough, Long-Lasting And Offer Excellent Protection From Squirrel Damage. Using The Simple But Highly Effective Perching Rings, Birds Can Feed In Their Natural Feeding Position - Facing Forward. Other Benefits Include The Easy Flow Base, Tough Hanger And Cap - All Constructed From Corrosion Resistant Solid Metal Alloy. Seed Feeder Tubes Are Made From Uv-Stabilised Polycarbonate, Which Will Not Deteriorate When Exposed To Sunlight. Each Component Has Been Ergonomically Designed, Providing Excellent Performance Benefits And Ease Of Use. The Feeders Also Completely Dismantle For Cleaning.