The basic structure is welded chromoly steel tubing. Drip irrigation systems distribute water through a network of valves, pipes, tubing, and emitters. Standard fittings require no modifications to the tubing. The induction coil is usually made of copper tubing and fluid coolant. The bike has a trellis frame made of steel tubing and aluminium castings. Most of these use a length of polyethylene tubing wound on a steel drum. There are two basic types of copper tubing, soft copper and rigid copper. The cage was lighter and stiffer by using different diameter tubing where possible. It was constructed of steel tubing with woodwork panels. A method used for carbon steel tubing is remote field eddy current testing. Owners often refer to this as "tubing" and promote the behavior by supplying lean tubes. Plastic half tubing that protected the axles of the trucks. Compression of this ferrule also results in deformation of the copper tubing. In 2006, Lin completed "Waterline", which is composed of aluminum tubing and paint. Cross-linking is accomplished during or after the extrusion of the tubing.