These are 2 fiberglass pontoons, or outriggers. They can be used for a sailboat, or to build a swim platform, or floating dock. Pontoons are in good shape. They are hollow with four hatches that can easily be removed to clean them out if necessary. Both pontoons have aluminum brackets that were custom made for these pontoons. The brackets are very heavy duty. I have listed the dimensions at the end of this posting. I am asking $400, but will entertain other offers. Pontoons are 7' (length), 16" (height), 12" (width at the top).