Hard Paper Joint Sleeve / Cardboard Tube is a rigid protective sleeve made from heavy-duty cardboard. It is designed to protect fragile laboratory glassware, joints, or other delicate items during storage, handling, or transportation. The natural brown colour and sturdy construction make it ideal for safe packaging, shipping, and organization of laboratory components. Durable, lightweight, and eco-friendly, these tubes are widely used in laboratories, workshops, and shipping applications.