rOtring Tikky hi Polymer Lead Refills, 0.7 mm, HB (312690)

Brepen

Rotring hi-polymer lead and their extra strong formula provide a solid base on which you can build. These pens are professional accessories that enable all sketching, writing and drawing styles and shades.

Amazon

High-polymer leads for quality results Leads are extra-strong and flexible for all day writing and drawing Easy to erase Ideal for fine mechanical pencils Pack includes 12 pieces