1. INKLESS PENCIL LEAD SET: This set includes 10 inkless replacement pencil leads for durable pencils. Inkless pencil leads are specially formulated to not require ink and are designed to last. 2. DURABLE: These inkless pencil leads have durability and are designed to last. They do not lose their writing function when the ink dries out and retain their handwriting for a long time, regardless of temperature and weather conditions. 3. QUALITY MATERIAL: These pencil leads are made of quality graphite and metal materials, ensuring smooth and clear writing. They feature consistent quality and uniform hardness, making them suitable for various writing needs. 4. ECOFRIENDLY CHOICE: Inkless pencil leads eliminate the need for ink and reduce environmental impact. The working principle is that the pencil tip rubs against the paper, decomposing alloy metal molecules that remain on the paper. They are environmentally friendly, safe, and contribute to protecting the environment.