Eighteen seeds from Mount Wutai.

The eighteen-bead string evolved from Buddhist beads and is a type of Buddhist beads. It implies the eighteen realms in Buddhism.

The six sense organs (the realm of the eyes, the realm of the ears, the realm of the nose, the realm of the tongue, the realm of the body, the realm of the mind);
The six sense objects (the dust of form, the dust of sound, the dust of smell, the dust of taste, the dust of touch, the dust of dharma);
The six consciousnesses (eye consciousness, ear consciousness, nose consciousness, tongue consciousness, body consciousness, mind consciousness).
It implies being protected by the light of the Buddha and praying for blessings and good fortune.

Generally, eighteen small round beads are selected, with two elaborate and magnificent Buddha heads - a Buddha head tower and a pendant added in the middle. Therefore, it is also called the eighteen-bead string.
The eighteen beads represent eighteen kinds of afflictions. Turning each bead means getting rid of one of the afflictions.
The eighteen-bead string blessed by the monks in Wutai Mountain is just like the eighteen arhats.

Each bead has its own implication:
Moon and Star Bodhi: Peace, joy, self-cultivation and character building.
Yellow Chalcedony: A flood of wealth, peace and good health.
Aquamarine: The stone of courage, the birthstone of March, symbolizing love and courage.
Toothless Vajra: Symbolizing kindness, prosperity and good fortune.
Black Agate, Red Agate: Peace.
Golden Silk Jade Bamboo: Peace, health, and purification of the mind.
Ebony: Good fortune.
Red Jade: Festivity, benevolence.
Golden Silk Bodhi: Enlightenment, luck, giving oneself strength.
Tiger's Eye Stone: Peace, health, and success in career.
Great Tianyi: Wisdom, smoothness and accordance with one's wishes.
Amazonite: Luck, financial fortune.
Ice Flower Mani Seeds: Happiness, good health, and peace of mind.
Black Mountain Stone: Financial fortune.
Vajra Bodhi: Invincible, wisdom and courage.
Phoenix Eye Bodhi: Peace and good fortune.