PITT Graphite Crayons, 2-Crayon Set - 6B & 9B - Forstall Art Center
Amazon.com : Lyra Graphite Crayons - 6B Graphite Stick Crayons for Artists and Students of All Ages - Set of 12 Durable Graphite Sticks for Sketching Drawing Shading and More : Artists
Lyra Water-Soluble Graphite Crayon 6B - Philadelphia Museum Of Art
Lyra Non-Toxic Water Soluble Graphite Crayon, 6B Tip, Pack of 12