EarthBox Staking System Includes: 5 sturdy aluminum tubes/poles, 2 grey plastic T-connectors, 2 aluminum straight connectors, 2 rim clamps with stainless steel hardware, 1 trellis net, 2 plastic outriggers with built-in caster sockets, 2 casters and instructions. 4 additional casters are required to make the unit fully mobile (Sold Separately) All plastic components are durable, food-safe, and UV-stabilized. This item is designed to fit 2nd generation EarthBox (manufactured after 11/2005). Includes EarthBox One Year Satisfaction Guarantee.