Urn thread for ink cartridges; Uses special thread that is good for marking and does not rott. Package Size: Length: 3.8 inches (96 mm), Width: 3.0 inches (76 mm), Height: 0.2 inches (6 mm); Package Weight: 0.4 oz (10 g); Material: Thread: Nylon; Thread Length: 66.6 ft (20 m)