An Engineered Plastic Concrete Forming System. Poly Meta Forms are a light weight and green alternative to traditional wood forming. Weighing 50% less than wood and having uniform straightness makes poly forms the simple choice when forming sidewalks, slabs or driveways. Poly Meta Forms® system allows for horizontal and vertical adjustments by simply loosening the wedge on the steel pockets. The Poly forms resist moisture and are recommend to be used with a release agent.