30" Coco Liners for Traditional Window Boxes and the Traditional Adjustable Deck Trough, Set of 2 These preformed Coco-fiber liners are made to drop right into your existing 30" Traditional Window Box or 30" Traditional Adjustable Deck Trough.. Dimensions: Approximately 30" Long x 7" Wide x 7" Deep These Coco Liners are sold only as a set of 2. LIFETIME SERVICE POLICY