Building a Pro Horse Fence with Plastic Forests recycled plastic Equine PLUS Post. Horses can injure themselves easily, so why use fencing materials that put them in danger? Regardless of species, from horses to cattle and sheep, Plastic Forests have a post to suit. Made from recycled bale wrap with a BHP steel core, these posts can take knocks and bounce right back. Due to their plastic construction, for the contractor they drive easily and have the added advantage of minimal noise. The lack of need for extra fittings and fixings reduces the cost of your fence in the long term and promises years of maintenance free service.