These round tubes are brass, very strong but light weight. Each size telescopes into the next corresponding size. For use in plumbing, HVAC and automotive. It can be soldered, glued, polished, cut and bent to whatever shape required. UPC: 614121181281 Manufacturer Part No: 8128 Brand Name: K&S Diameter: 5/32 in. Length: 12 in. Shape: Round Product Type: Brass Tube Number in Package: 1 pk Application: Scratch builders, modelers, crafts, machine shops and architectural Packaging Type: Carded Wall Thickness: 0.014 in. Finish: Mill California residents see Prop 65 WARNINGS