This series of TS needles is available in two versions. One is called TS-M with an aluminum body and steel cannula, which is only supplied in packs of 500 and is used in general applications.
The TS-SS version has a steel cannula and a nickel-plated brass body, is supplied in packs of 12, and is used for precision applications.
Both versions are available with various cannula diameters and in the case of the TS-M version, also with various cannula lengths.