The Zildjian K Custom Dark Hi-Hat Pair have a fast, bright chick that cuts through. The K Custom cymbals are specially designed to provide more volume and cut with a quicker attack and decay than traditional K Zildjians. 14" diameter. 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.