545
Ring rolling is a flexible forming process used to produce seamless rings with various dimensions and cross sections .
 manufacturing process: Ring rolling; manufacturing process: forming process; engineering feature: dimensions; concept or principle: cross sections
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 manufacturing process: Ring rolling; manufacturing process: forming process; engineering feature: dimensions; concept or principle: cross sections