The first batch of Takrut Nung Suea had passed the incantation ceremony together with the famous Takrut Khuchivit in B.E.2531. Design of the amulet is Suea Khrong's skin (Bengal Tiger). It must be Suea Khrong's skin ONLY! The measurement is approx. 2.5"-3" length, depends on the tiger skin pieces (from body, leg etc.). Luang Phor did not want to waste any piece so he used all of the pieces, that's why the amulets are in slightly different length. My experience, I have seen over 30 pieces of Takrut Nung Suea and never seen any longer than 3". The design is Suea Khrong's skin rolled and inserted in small rubber tube (see photo) with Thai National Flag's colors painted on the rubber. Those must be in similar major colors. For any which is different than this, I cannot guarantee.
Takrut Nung Suea is very very rare. There may be less than a hundred. It is in highly demand of direct disciples. Luang Phor had distributed them to his first group of disciples. Some had never seen one because there are only a few. Most of them are occupied by his disciples in Taiwan, Hong Kong, Tibet and Malaysia.