Abstract: A railing system with a pair of supporting posts and upper and lower rails extending between the posts includes a plurality of balusters extending between the rails. The balusters have a longitudinal axis, a curved portion and an opening extending through the baluster in a direction perpendicular to the longitudinal axis. An extension member extends through each opening in the plurality of balusters to prevent the balusters from rotating about their longitudinal axis. The openings may be asymmetrical about the longitudinal axis, with the cross-sectional dimension of the extension member corresponding to the dimensions of the openings so that the extension members may extend through the openings of a plurality of balusters only when the balusters are aligned with their curved portions in the same direction.