Amazon.com offers the Pentel Graph Gear 1000 Automatic Drafting Pencil, 0.5mm Lead Size, Brushed Metal Barrel, 1 Each (PG1015A) for $8.99
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Features: Chiseled metallic grip inlaid with soft latex-free pads provides writing comfort. Dual-action retractor advances and retracts tip for easy use. Superior drafting pencil for general and technical writing.Refillable with Pentel Super Hi-Polymer Lead and Z2-1 eraser