The Large U-Phase patented tip design marks MCM wire up to 3/4" ø quickly, effectively, as well as smaller AWG wire (U.S. Patent No. 7,320,553).Marks adhere to clean sheath permanently and resist handling, abrasion, and heat. U-Phase gives 10 times more mileage at a 20% lower cost than vinyl tape. Greenlabel paint has lower environmental impact than vinyl tape. Great for color coding and identification of circuits, computer CAT-5 cables, automotive wires, telephone wires and coaxial cables.