What is Mechanical Pencil or Propelling Pencil

Answer 1

A mechanical pencil, or propelling pencil, is a refillable pencil that never needs sharpening. These pencils are made from metal or plastic (often both) and have a mechanism for pushing out the graphite ("lead") so you can draw with it. With traditional pencils, the pencil lead is revealed by removing the wood around it with a pencil sharpener.