Calacatta Viola 1/2″ Pencil Liner Moulding is a type of marble trim that features a white background with gray veining. The moulding has a pencil-thin profile and is 1/2 inch in width, making it a great accent piece to frame and enhance the edges of tile installations. The finish of the moulding can be either polished or honed, depending on the desired look. Calacatta Viola 1/2″ Pencil Liner Moulding is often used in bathroom and kitchen designs to provide a finishing touch to the edges of tile installations.