Kao EG runner™ (high temperature resisting paper tube) has the following advantages: (1) it is easily and quickly installed on runner systems for sand gravity casting during the sand mold production; (2) bottom gating system design is easily executed without complicated wood pattern design; (3) the special junction design in EG runner is more easily and simply assembled comparing to the traditional ceramic tube. Moreover, it is much light weight. (4) it has been awarded a SOKEIZAI prize in Japan (SOKEIZAI is Japanese word that denotes those products made of metal or other raw materials by using material processing methods which apply force or heat to raw materials against some molds or dies to fabricate them into almost the net shape of the product in a single or short-time operation.) and it is a green product for environment.