the price on the rubber material is typicaly extreamly steap. I was mulching a hose a few weeks ago and the naighbor had black rubber mulch in there kids play area. Alot of it was coming over the edges and seemed like a hassel to clean up. I would stick withe the playground material that you can get from your wholesale mulch supplier. Much cheaper and still provides the cushuon that you need under a play set. The good supliers usualy have the material cetified to be used in playgournds. This is all we put in playgournds in our area.