Sahure's pyramid was constructed in a drastically different manner to those of the preceding dynasty. Its outer faces were framed using massive – at Neferefre's unfinished pyramid the single step contained blocks up to by by large – roughly dressed grey limestone blocks well-joined with mortar. The inner chambers were similarly framed, but using significantly smaller blocks. The core of the pyramid, between the two frames, was then packed with a rubble fill of limestone chips, pottery shards, and sand, with clay mortaring. This method, while less time and resource consuming, was careless and unstable, and meant that only the outer casing was constructed using high quality limestone.