The earliest historical accounts of instruments resembling those of the present day kulintang are in the writings of various European explorers from the 16th century who would have seen such instruments used in passing. Because of limited data concerning gong music prior to European exploration, theories abound as to when the prototypes of what is now the kulintang came to be. One theory suggest that the bronze gong had an ancient history in Southeast Asia, arriving in the Indonesian archipelago two or even three thousand years ago, making its way to the Philippines from China in the 3rd century AD. Another theory lays doubt to the former claim, suggesting the kulintang could not have existed prior to the 15th century due to the belief that Javanese (Indonesian) gong tradition, which is what the kulintang was believed to be derived from, developed only by the 15th century. Though different theories abound as to the exact centuries the kulintang was finally realized, there is a consensus that kulintang music developed from a foreign musical tradition which was borrowed and adapted to the indigenous music tradition already present in the area. It's likely the earliest gongs used among the indigenous populace had no recreational value but were simply used for making signals and sending messages. Kulintang music likely evolved from this simple signaling tradition, transitioning into a period consisting of one player, one-gong type ensembles (like those found among the Ifugao of Luzon or Tiruray of Mindanao), developing into a multi-gong, multiplayer ensemble with the incorporation of concepts originating from Sunda and finally transforming into the present day kulintang ensemble, with the addition of the d’bakan, babndir and musical concepts of Islam via Islam traders. The instrument called the “kulintang” (or its other derivative terms) consist of a row/set of 5 to 9 graduated pot gongs, horizontally laid upon a frame arranged in order of pitch with the lowest gong found on the players’ left. The gongs are laid in the instrument face side up atop two cords/strings running parallel to the entire length of the frame, with bamboo/wooden sticks/bars resting perpendicular across the frame, creating an entire kulintang set called a "pasangan". The gongs weigh roughly from two pounds to three pounds each, and have dimensions of 6 to 10 inches for their diameters and 3 to 5 inches for their height.