| 摘要 |
PURPOSE: A writing instrument having an air pocket is provided to ensure convenient storage because the air pocket, which surrounds a core, can be inflated or deflated selectively. CONSTITUTION: A writing instrument comprises a core(1) and an air pocket(10). The air pocket surrounds the core except for one end exposed. The air pocket has a space to be filled with air, an air injection part(15) for inflation and deflation, and an air leakage prevention unit for keeping air in the air pocket. |
