Techromatic Colored Lead by TEC Pencil Co Lead, 3.6mm, Blue LD598 Techromatic Colored Lead by TEC Pencil Co in Beverly Hills, California. Bright yellow cardboard box holds 12 pieces of dark blue crayon type leads. Each lead is pre-sharpened. 3.6mm diameter, 3.75 in length. Box has 11 leads. (1 avail) $10.00 SKU: LD598 Read more about Techromatic Colored Lead by TEC Pencil Co Lead, 3.6mm, Blue