SRT is an acronym for "Suspended Rod Technology" and that is what makes this stabilizer work. SRT incorporates a piston shaped rod partially suspended in Vibrasorb Gel. At the shot this rod is able to move and rotate in every direction with the gel providing resistance. The SRT features machined aircraft aluminum parts, Kolorfusion camouflage that makes this a great deal for bowhunters. 6" long, 5oz in weight, colors: Black & Breakup.