The EasyClean Pavilion one of our first hopper feeders to incorporate the Squirrel-Blocker defense system. The hidden two-grid defense system sits above the seed source providing absolute protection from gray squirrels. Made from squirrel resistant nylon resin, tray has built-in drainage holes. Hang or pole mount. No batteries, springs or weights. Use black oil sunflower seeds only, holds one pound of black oil sunflower seed.