Pilasters (Flat Back Columns)Pilasters are carved flat backed columns useful for ornamenting trim or other flat surfaces. Fibrous Plaster offers a range of styles that can be modified to suit your requirements. Many shown with optional capitals. The colored pilasters are designed from fiberglass and are recommended for indoor use. The polyurethane pilasters come in 3 parts so the capital, shaft, and base of the pilasters may be purchased separately.