"This marker stains! The OTR .171 is filled with an ingenious mixture of Hard to Buff ink and bitumen. Yes, you read it correctly, our ultra permanent and highly pigmented ink meets pitch black viscous bitumen! Only the OTR COLD SWEAT allows for such completely opaque and thick coatings by Pump Action marker. Shake well before use until the mixing balls are clearly audible. Pump the tip until it is filled with ink – repeat when whenever necessary to keep up the ink flow."

– On The Run