These rectangular 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: 614121182622 Manufacturer Part No: 8262 Brand Name: K&S Length: 12 in. Product Type: Brass Tube Shape: Rectangular Number in Package: 1 pk Width: 3/16 in. Application: Hobbies and model building Depth: 3/32 in. Packaging Type: Carded Wall Thickness: 0.014 in. Finish: Mill California residents see Prop 65 WARNINGS