1) Made of fibre glass, never rust. 2) Different capacity, 4.8, 6, 7.5, 10.8, 12,15 ton. 3) Used for mesh or pellet feed 1) Made of fibre glass, never rust.2) Different capacity, 4.8, 6, 7.5, 10.8, 12,15 ton.3) Used for mesh or pellet feed Never Rust Fibre Glass Feed silo