Explanation: One of the key aspects of the Mesolithic Age was the reduction in size of well-established tool types.

• The characteristic tools of this age were microliths (miniature stone tools usually made of crypto-crystalline silica, chalcedony, or chert, both of geometrical and non-geometrical shapes).
• They were not only used as tools in themselves but also to make composite tools, spearheads, arrowheads, and sickles after hafting them on wooden or bone handles.

Source: Tamil Nadu NCERT