General Pencil Co. Compressed Charcoal Sticks - Compressed Charcoal Sticks are extra smooth. Available in 2 shapes: square and rectangular and 3 degrees of hardness: 2B, 4B, 6B. Square sticks are also available in white. Each rectangular stick measures approximately 3x1/2x1/4 inch. Each square stick measures approximately 3x1/4x1/4 inch. Rectangular sticks are sold in a box of six sticks. Square sticks are sold in a box of 12 stocks. Compressed Charcoal Sticks are priced by the box.