You buy arrowheads and spearheads in the selected sizes of agate. Hand cut with great workmanship, suitable for reproduction of the spears of the indigenous people or jewelry making. If post-processing or wrapping the upper part they can also be used as a hand ax or stone knive/dagger.
Picture exemplary, the pieces come in many different colors and patterns. They are all completely straight cut, the image of the top left outside is deceptive in that regard.