Specification: Tube diameter: 1.3mm Tube length: 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm What's included: 1 Box of 1.3mm Diameter Watch Spring Bar Tubes Screw Lug Type for Ceramic Steel Band Notice: packaging may vary due to different production batch.