This keystone features deeply recessed details. It is traditional in appearance and precision-molded in urethane, one of today's most versatile and cost-effective decorative materials. The recessed keystone is designed for use with the flat moulding style (FLT152). Decorative or faux keystones add prominent detail to home improvements, and they easily update existing trim elements. Now you can have the prominent detail of a keystone without the masonry or traditional labor associated with structural keystones. The recessed keystone is non-porous and suitable for use in both interior and exterior applications. It is also pre-primed and ready for finishing and easy installation.