PVC Boxed Split-Raised Panel Columns Made of Cellular Polyvinyl Chloride and has the thickness, "ease of use" and workability of wood. The Boxed Column comes in standard lengths from 3-18 feet. Available with plain, fluted, raised or recessed panels. PVC is unaffected by moisture and insects. They will not flake or "bleed" when painted. The Boxed Column is easy to tie into a railing or balustrade to give your porch or stairway a polished look. They offer a great look for a great price.