Gravity Feeders Made of 100% Heavy Duty plastic. Our feeders hold 70lbs of corn or 40lbs of dry dog food and our other feeder holds145lbs of corn. Ratchet straps to any tree or post in minutes on the steepest of hills or thickest of thickets. No tools, batteries, or parts needed. Bears and Hogs can't tip it over./ You can see more @ lougravityfeeders.com