10 1/2 x 10 1/2 x 72" Telescoping Outer 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 T101072INNER to complete the set. Manufactured from 200#/ECT-32 kraft corrugated. Cartons have a FOL (full over lap) bottom for added strength.