DW 9000 Series Hi-Hats utilize a patented Double Eccentric Cam (shown left) that increases the sensitivity of the footboard in relation to cymbal movement, resulting in a unique, incredibly fast and responsive feel. (U.S. Patent No. 5266733)The Infinitely Adjustable Locking Spring Tension feature (also shown left) allows for precise adjustment to offset the weight of the top cymbal, creating a customized feel. (Infinite Adjusting Spring Tension on 9500 and 9502LB)
