Set of 10 0.3mm mechanical pencil leads using Nano Dia technology. - Model Name: Uni 0.3-202ND - Lead Diameter: 0.3mm - Material: Nano Dia - Color: Black - Quantity: Set of 10 Thank you for viewing. These are replacement leads for uni. I think I bought them about 10 years ago. Stored at home in the box. I will put them in the box and wrap them in packing material before sending. Thank you for your consideration.