Bamboo is the most environmentally sound plant in the world - sustainable, cost effective, and ecologically responsible. Feeders and houses are made from Cross-ply bamboo that is 5X harder and stronger than cedar. It is resistant to bacteria and squirrels, with no rotting, warping or swelling. The Nature's Way Bamboo Upside-Down Suet Feeder #NWBWF2 holds two suet cakes. The roof lifts for easy refilling. Upside down feeding invites desirable clinging songbirds and woodpeckers to feed and excludes birds like starlings that cannot hang from the feeder.