Ibonoito Tenobe Somen Advanced Grade 300g Ibo Noito" hand pulled somen noodles are made by kneading wheat flour and salted water together, and then "kneading" and "maturing" the mixture repeatedly to gradually make it thinner and thinner, a labor-intensive process. About 430 manufacturers have established strict inspection standards to produce uniform somen, and more than 20 inspection instructors provide inspection guidance.