About 400 million nano-diamond particles are blended in each leads, which make them smoother, stronger and darker
- Contains approximatey 400 million nano-diamond particles in each leads
- Smooth and break-resistance
Strong and Smooth Writing
Each Nano Dia pencil lead contains diamond component and enhance firm internal graphite structure. This also improve smoothness and darkness.
Design to use conveniently whereby the lid can open twosteps.