Some of the limestone was stripped from other monuments, blocks of stone from the pyramids of Khufu, Khafre, Unas and Pepi II (or possibly Pepi I) have been found in the pyramid.[6][5] Inside the pyramid a sloped shaft blocked with granite plugs upon burial ran from the ground level entrance chapel to a vertical shaft that descended directly to the burial chamber.[4] The overall construction of the pyramid was poor and little of it remains today.[7]