Now, there is type E durometer in accordance with NEW JIS, but the standard to measure hardness of soft rubber like eraser was not available in the previous JIS standard. Then this SRIS 0101 was established by Japan Rubber Association for the purpose of ruling standard of the Association apart from JIS. As is half ball type osibari this is suitable for soft material like soft rubber (expanded rubber ), hardness of spool of textile and film roll to which osibari sticks if it is type A durometer. It also conforms to JIS S 6050 “plastic letter distinguisher”