• MULTI-PURPOSE – Great as a construction marker; arts & crafts; marking china, glass, and ceramics.
• IDEAL FOR SMOOTH SURFACES – Including plastic, metal, ceramics, polished stone, glass, film, glass, wood, garments, paper, cellophane, vinyl, and more!
• EASY-TO-USE – Convenient, refillable pencil uses china marker / grease pencil leads.
• Specialized wax-pencil leads formulated for bold markings.

You can also buy the leads here.