The ROSTA tensioning elements type SEI are all made out of stainless steel. They are available off-the-shelve in four different sizes: SEI 15, 18, 27, housing in SS casted version, SEI 40 (similiar to SE 38), housing in SS welded version.The stainless steel quality complies with the DIN 1.4301 and AISI 304 specifications. These tensioning elements have been pirmarily designed for applications in the food industry and the chemical process technology.