The Large Obsidian blade in this picture is from Siskiyou Co., California and measures 30 inches long. The four points in the center are laying on the Sweetwater Biface from Texas and were all made by Ishi. The two in the center are made of glass and the two on the ends are made of black Obsidian. The other arrow points in this picture were all made of glass and were surface collected many years ago in California.