Name the given object according to its function.
Object: A mechanical pencil
A mechanical pencil is a writing instrument that uses lead, typically encased in plastic, to create precise lines on paper.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Name the given object according to its function.

### Response:
A mechanical pencil is a writing instrument that uses lead, typically encased in plastic, to create precise lines on paper.