These tubes have a 3" inside diameter and unique design that permits telescoping from fully closed 18-1/2" length to a fully open 43" length. Twist-lock feature at desired lengths. Made of rugged black plastic, tube is water-resistant and ideal for a multitude of uses. “Twist-off” screw cap has window for viewing contents inside tube and identification label to mark its contents. Adjustable carrying strap allows tube to extend to any length and provides convenient portability.