Since its release in 1993, the Iron Cobra has been the world's most highly rated pedal. At the core of the Iron Cobra series sits originality, and an unwavering commitment to constant innovation and evolution. With numerous limited edition models over the last two decades, this 50th Anniversary Limited Edition model serves as a special celebration of the Iron Cobra's long and storied history. Featuring two colorful designs, Coral Swirl and Psychedelic Rainbow, the Iron Cobra Marble Edition pedals are visually stunning, yet again setting the Iron Cobra apart from all others in its class. Cobra Coil (US. PAT.NO.7408104) Power Glide LiteSprocket Speedo-Ring Oiles Bearing Hinge Para-Clamp II Pro Swivel Spring Tight (US.PAT.NO.9236038) Power-Strike Cobra Beater Power-Strike Cobra Beater The constant evolution of Iron Cobra has always been driven, in part, by TAMA's passion for sound - or more precisely, TAMA's passion to bring the best out of each and every bass drum on which Iron Cobra is played. The latest version of Iron Cobra features a smaller diameter but thicker beater head - a combination that delivers more attack than previous designs. Also the distance between the beater head's face and the shaft has been increased. Drummers found this alteration improved their sense of control during faster passages. Swivel Spring Tight (US.PAT.NO.9236038) The conventional approach to the spring assembly has been to anchor the bottom of the spring while the top of the spring is being pulled from various angles throughout the pedal's cycle. But a spring being pulled on at an angle represents wasted energy and causes turbulence. The Swivel Spring Tight assembly solves this problem, recapturing that lost energy and optimizing smoothness through the use of a contoured assembly that allows the base to swivel freely with the spring. This enables a straight spring pull during the pedal's entire cycle, resulting in the smoothest, lightest action ever found on a bass drum pedal.