• Easy to refill the case-Simply peel the self seal one at a time and remove the sharp lead directly from the refill package to refill it into the case easily.
  Refillable allows you to use it over and over again without throwing out the case.
  
• Sustainable refill packaging made of cardboard material
  Slim cardboard with a 0.2 inch (4 mm) thickness and a sharp core, and a design that utilizes the natural texture of cardboard material.
  
• The seal to seal the core is also a paper material, so after use, you can use it as a resource waste (old paper or cardboard) to be collected and reused. This product is not only refillable but also the packaging material is environmentally friendly.