Royal Corinthian manufactures balusters from polyurethane, fiberglass, and synthetic stone. We only offer composite material made in America that will last for generations: Wood rots, concrete crumbles, aluminum rusts, and vinyl is flimsy and has a cheap appearance. We are the only manufacturer in America that manufactures the same spindle styles from 3 different materials. This allows for someone to mix and match our products on a single residence or commercial project. For example, our synthetic stone balusters can be used on a front porch where they are prominent and polyurethane balusters of the same style can be used on the rooftop or balconies where weight is of concern.