Specialty pencils formulated for tracing film and other non-porous or porous surfaces—ideal for auditioning quilting designs without marking the quilt. Moisture-resistant lines are legible yet wipe clean with a dry cloth. Use with Unique Longarm Pattern Tracing Film or glass and plastic; avoid direct use on fabric or quilt blocks. Built for reliable results in sewing rooms, classrooms and studios; always test on a scrap for best outcomes.