Pneumatic Air Scribe Engraving Pen Pencil Grinder Engraver Tool Chisel Tip Hose Pneumatic Air Scribe Engraving Pen With Chisel Tip Engraving Tool. *Tube color may vary: BLUE or YELLOW* Lightweight and easy to use. Clear plastic case INCLUDED Air consumption is extremely low at 1 cfm, and that means your compressor won't be struggling to keep up. Simply connect a compressed air source to this tool and you are ready to work. Quantity: 1 ; Shipping weight: 10 ounce