One-piece paper tube, also known as single paper tube, consists of a one-piece-thru tube body and lids on both ends.
Two-piece paper tube, also called telescoping (telescopic) paper tube, consists of a cardboard tube body (base) and a over-cap to create a hatbox-style paperboard cylindrical packaging box.
Three-piece paper tube, also known as butt jointed tubes, full telescoping (telescopic) paper tube, or flush-fit paper canister, consists of 3 parts: outer base, inner neck and top cap.