The ROSTA tensioning elements type SEI are all made from stainless steel. They are available off-the-shelve in four different sizes: SEI 15, 18, 27, housing in SS casted version, SEI 40 (similar to SE 38), and housing in SS welded version.

The stainless-steel quality complies with the DIN 1.4301 and AISI 304 specifications. These tensioning elements have been primarily designed for applications in the food industry and chemical process technology.