Zildjian K Custom Fast Crash. The Custom Fast Crash Cymbal features a new bell design that results in a faster decay and quicker response than regular K Custom crashes. Art Blakey, Elvin Jones, Tony Williams, and scores more musical movers have sworn by the deep, dry, shimmering K sound developed in 19th century Turkey. The K Custom cymbals are specially designed to provide more volume and cut with a quicker attack and decay than traditional K Zildjians. K Custom cymbals time-proven techniques driven into new territory. Order now. Your kit will sound better than you thought possible.