Sicariis AER 15ci 4500psi Carbon Fiber Air Tank w/ First Strike Hero 2 RegulatorSicariis AER 15ci 4500psi Carbon Fiber Air Tank with First Strike Hero 2 Regulator Slim Profile. High Pressure. Maximum Tactical Reach. The Sicariis AER 15ci 4500psi Carbon Fiber HPA Tank is engineered for the tactical player who prefers a streamlined, elongated setup over a bulky bottle. While smaller in volume than the 26ci version, this 15ci tank features a longer, slimmer profile, making it the perfect choice for players who use their tank as a