It is actually very difficult to find stunning Phra Kham baeds, the ones that total 108 to help with counting kata because there are too many cheap examples. These are the best I have found and they are from an important temple near Li, a couple of hours south of Chiang Mai.
These are a large bead that have been hand cut from a Makham Tree that died in the temple grounds and were then soaked in an oil for Metta and popularity. The temple they come from is an important one as it was the abode of Kruba Wong, one of the disciples of Kruba Sri Wichai who did not rot after death and is now in the main hall covered by a glass dome and layers of gold leaf.
Whenever I visit this temple to make merit I always buy a couple of these strings of beads because they are simply the best and a true example of making a set of hand cut beads from the correct wood and then fully blessed by top monks.
I have 2 strings and will then go back...
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Stunning Phra Kham Beads from Wat Phra Bat Huai Tom
Pure Buddhist amulets (without Prai materials) are known as Puttakhun magic and they work in a gentler way but still offer sustained magical force.