Sabian HHX X-Celerator Hi-Hats (pair). HHX X-Celerator Hats are designed by the SABIAN Vault Team to deliver the hot, and dark, simmering tones of HHX with increased speed and crisp, highly defined clarity. While the simmering HHX tonality is generated by the medium-weight top cymbal, the speed and crispness are created by the heavy bottom and its contoured 'Air Wave' design. These contours expel air when the cymbals come together, eliminating sound-muting airlock to create a combination of tone and projection. See www.Sabian.com for more information.