The Droll Yankees HummerPlus Brush is a 9 in. curved brush especially designed for cleaning rounded hummingbird feeders and other circular crevices. Also effectively cleans the ports on tubular bird feeders. The soft flexible bristles will clear debris without scratching the plastic. Clean feeders make for happy and healthy birds. Dirty feeders can spread disease but washing them periodically removes any mold or bacteria that could make birds sick. This brush is proudly made in the U.S.A.