There are many different versions of kekkai.

~One version is the cube. The cube can be created to be the size to fit a cockroach to the size to fit an elephant. The cubes power was revealed mostly in comic 3. It states that the cube can grow a bump on it to deflect attacks. This was revealed when Yoshimori and Tokine were fighting the hawatari. The hawatari sent its ice bullet at Yoshi but instead of the bullet hitting them, the bump came out nd bounced the attack back. Another way this can be used is as a shield and the only things showed that can penetrate this wall of defense is Madaroas and Koyas tail and Hawataris ice bullet. The cube is the most used kekkai.

~Another version is the string. The string was only used so far to bind Honetaro and also to create the seal back together to fit Madaroa into its original form. That is practically all i know about it.

~Another version is one i like to call "Tokine's Arrows". They are littles staffs that must be used in combination with the cube kekkai unless it wont work. They are ver powerful considering they took down 3 ayakashi formed as one extremely strong ayakashi.

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