8 x 8 x 48" Double Wall Telescoping Inner Boxes. HSC style carton can be used alone or combined with companion piece for an adjustable, 2-piece set. One inner and one outer carton required to make a set - sold separately. Combine with T8848OUTERDW to complete the set. Manufactured from 275#DW/ECT-48 kraft corrugated. Cartons have a FOL (full over lap) bottom for added strength.