Maitreya , Metteyya , or Jampa (Tibetan), is foretold as a future Buddha of this world in Buddhist eschatology. In some Buddhist literature, such as the Amitabha Sutra and the Lotus Sutra, he or she is referred to as Ajita Bodhisattva.

Maitreya is a bodhisattva who in the Buddhist tradition is to appear on Earth, achieve complete enlightenment, and teach the pure dharma. According to scriptures, Maitreya will be a successor of the historic Sakyamuni Buddha. The prophecy of the arrival of Maitreya references a time when the Dharma will seem to be forgotten on Jambudvipa. It is found in the canonical literature of all Buddhist sects and is accepted by most Buddhists as a statement about an event that will take place when the Dharma will seem to be forgotten on Earth.

size and weight as mentioned in the picture

it's approximately calculation for guidance