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The Heart of Wisdom Sutra (Sanskrit: <प्रज्ञापारमिताहृदय Prajñāpāramitā Hṛdaya, Tibetan: >shérab nyingpo) is a central text of Mahāyāna Buddhism. It is undoubtedly the best-known Buddhist sacred text.
and most importantly. It is among the most popular,
and it is very regularly recited by both monks and lay Buddhists. This text is called the "Heart Sutra" because it contains the heart of the teaching of the Prajnaparamita . It is a short version of the Prajñā Pāramitā, a set of texts
of very variable lengths composed between the first century AD and the sixth century AD, whose main theme is the Perfection of Wisdom (Sanskrit: Prajñā ), namely the emptiness (Sanskrit: śūnyatā) of all things and all phenomena.
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The fact that the Heart Sutra contains a mantra generally leads to this sutra being classified among the late texts of the Prajñāpāramitā , influenced by tantrism; it is also classified as a tantra in certain editions of the Tibetan Kangyur and is considered not only a sutra, but also a dharani magic formula.
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Here is the French translation of the short version of the Heart Sutra:
The Bodhisattva of Great Compassion, Avalokiteshvara ,
through his deep practice of the Great Wisdom,
sees that the five aggregates are only emptiness
and by this understanding he relieves all suffering.
Forms are not different from emptiness and emptiness is not different from forms. So it is also with sensation, perception,
mental formations and consciousness.
All existences have the aspect of emptiness. They are without birth or extinction, neither pure nor defiled, they neither increase nor decrease.
So in the void there is no form, no sensation, no perception,
no mental formations, no consciousness; no eye, no ear, no nose, no tongue,
no body, no consciousness. There is no color, no sound, no smell, no taste, no touch, no thought. Therefore, in the void there is no sense domain.
There is neither ignorance nor cessation of ignorance, neither illusion nor cessation of illusion. There is neither degeneration and death nor cessation of degeneration and death. There is neither suffering, nor cause, nor cessation,
no path. There is no wisdom, no obtaining, no not obtaining.
For the Bodhisattva, thanks to the Great Wisdom which leads beyond,
The unobstructed mind knows no fear, and all illusion and attachment are removed. It can attain the ultimate end, nirvana.
All Buddhas of the past, present and future
practice the Great Wisdom and thus attain the most perfect awakening.
So, we must understand that Hannya haramita is the great shining and luminous mantra, the highest of all mantras which is incomparable and whose power cuts off all suffering.
This is the ultimate mantra and through it it is possible
to reach the essence of all truth. 
The mantra contained in these amulets is as follows:
OṂ GATE GATE PĀRAGATE PĀRASAṂGATE BODHI SVĀHĀ .
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Ancient Buddhist tradition says that if one recites this mantra
and/or if one wears an amulet of this mantra,
then we will receive the following benefits:
- We will develop wisdom
and the understanding of the emptiness of all things.
- We will develop compassion
and a deep connection with all sentient beings.
- We will purify our mind, we will avoid all disturbing thoughts
and we will have peace of mind.
- We will accumulate merits which will generate positive karma
and will bring luck and blessings.
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These mantra amulets were made and blessed in a Tibetan monastery in Bodnath (Nepal), they are mantra scrolls "handmade" by Lamas, their dimensions are therefore quite variable...
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Length: approximately 50 mm.
Diameter: approximately 15 mm.
Weight: approximately 12 grams.
New custom-made reliquary: Yes.