With a medium-weight top coupled with a heavy bottom featuring a contoured Air Wave design that expels sound-muting airlock, AAX X-Celerator Hi-Hats respond with accelerated speed and crisp, clean, and very definite stroke accuracy. AAX X-Celerator Hats feature an Air Wave bottom that eliminates sound-damping airlock, which improves the response rate by intensifying the "chick" sound of the cymbals when pedaled or played in the closed position. Open those cymbals slightly and that sound gets bigger, but always remains controlled and focused. This control and clarity make AAX X-Celerator hats ideal for stage and studio applications. The 13" size offers a smaller and tighter sound with typical X-Celerator cutting power in open and closed positions. Because it contains substantially more metal, the 15" model responds with a bigger, bolder, yet always bright and definite response, making it highly suitable for any situation requiring increased volume and a bigger size of sound. AAX X-Celerator Hats, like all AAX cymbals, are hand crafted from Sabian's professional B20 "cast" bronze, and quality, protected by the Sabian one-year warranty. And like all Sabian hi-hats, the top and bottom cymbals are Sonically Matched for optimum performance compatibility by the specialists in the Sabian Vault.