Marble and Travertine Soap Shelves are 9" radius and Shower Seats are 18" radius quarter circle. Currently we stock Ivory and Noche Travertine, Crema Marfil and White Carrara 9" soap shelves and Travertine 18" shower seats. 9" shelves packed in 50 or 100 pieces /crate and 18" shower seats are packed in 50 piece / crate quantities. Shelves and seats are sold individually.