The SB-36W professional studio boom with air suspension system offers effortless height adjustment and microphone protection. It includes an integral piston-type air suspension system and uses a two-piece horizontal assembly with adjustable 6 lb. boom counterweight. The triangular cast iron base has ball-bearing swivel casters of hard rubber for friction-free and vibration-absorbing mobility. Tubing terminates in the standard 5/8″-27 thread pattern.