Specifically designed for use with hydraulic jacks, 5th wheel stabilizers, swing-down stabilizers and awning arms to keep them from sinking into soft ground. Stack for increased height. eight orange units per blue bag. Approx 8" square and 1" thick.Lighter than wood, won't absorb water and won't rot. Easy to clean--just hose them off. Interlocking for convenient storage in enclosed carrying case. Solidly constructed of durable polypropylene with UV inhibitors. Pre-owned with travel trailers, pop-ups, wheels. Class C's, and Class A's.$10 for each bag of 8. 2 bags. Call (Listing originally posted at http