Take your exterior decor to next level with the addition of trim accents both large and small. The plain keystone enhances the 10" crosshead segment. It is crafted in durable urethane and it attaches easily. As with many functional architectural elements, the keystone also holds strong aesthetic value. It accentuates the home's most important architectural features. Now you can easily achieve the look of keystone accents with our decorative faux-keystones. The plain keystone is versatile I form and precision-molded in high-density polyurethane, a non-porous material that performs exceptionally well in exterior applications. Urethane accents compliment existing trim and they are long-lasting.