This copper C122 round telescoping tubing is suitable for fitting into tubes of the next size up or down for weight or flow increase or reduction. The tubing is seamless for a smoother interior flow and greater burst strength than welded tubing. It is corrosion-resistant, thermally conductive, and brazable, and has a half-hard temper (H02) to provide increased hardness and strength while retaining moderate flexibility and formability. This seamless round telescoping tubing meets American Society for Testing and Materials (ASTM) B75 specifications for quality assurance and is suitable for use in applications such as creating models and customized piping.

Metal tubing, also called fractional tubing, is used to transfer liquids, air, or solids, and it is characterized by a round shape and a hollow center. Metal tubing is commonly made with various grades of austenitic stainless steel, aluminum, copper, brass, and titanium materials and their alloys. Construction types include seamless, welded, or welded and drawn. Seamless tubing has no seam or weld point, which enables it to better withstand high pressure and resist corrosion. Welded tubing, made by rolling and welding metal sheet stock, is weaker than and not as rounded as seamless tubing, but it has a more consistent wall thickness for tighter wall tolerances. Welded and drawn tubing, also known as "drawn over mandrel" (DOM), is typically welded tubing that is drawn through a die and over a mandrel to create a smooth inner diameter, which gives the tubing comparable corrosion resistance to seamless tubing while still offering welded tubing's tighter wall tolerances. Compression, vacuum, sanitary, and flared fittings connect tubing or redirect flow in a fluid handling system. Metal tubing is used in HVAC and plumbing systems and for applications in the aerospace, automotive, chemical processing, food and beverage, manufacturing, and medical industries.