Sacred Marble Look Aum of Invulnerability
blessed by the Most Venerable LP Kui (1911 - 2011)
of Wat Sap Takian (Petchaboon).
* 
This ancient type of amulets Look Aum Sian Mak
is made from betel chewed by the Most Venerable LP Kui and over which he recited a secret incantation which makes them harden instantly.
These amulets protect their wearer against any type of weapon
and makes him faster and physically stronger in combat.
Muay Thai practitioners often place
such an amulet in their bracelets.
*
NB: Do not try to "test" the powers of this amulet. 
One day a visitor to Wat Satakian asked LP Kui if he could " test "
the protective power of one of the protective balls by pulling on it
with a gun.
LP Kui told him not to do such a test and that the weapon was very likely to explode.
and to hurt him, but this person did not listen to the Most Venerable Luang Phor Kui
and still took the test when he got home.
After 2 unsuccessful attempts (the weapon refused to work and jammed)
The gun exploded and seriously injured the shooter. He was hospitalized.
and when he left the hospital he took these photos before going to offer the exploded gun
(and his apologies) to the Venerable.
*
I got these invulnerability amulets on my last visit.
at Wat Sap Takian, during the lifetime of the Most Venerable Luang Phor Kui
and can therefore absolutely certify their authenticity.
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Weight: approximately 4 grams.
New custom-made reliquary: Yes (three reliquary models available).