Zildjian S Series 20" Medium Thin Crash with ChromaCast Accessories B12 Alloy: 88% Copper, 12% Tin  produces the perfect balance of low, middle, and high frequencies. Fully Lathed: Top and bottom lathing  crafted to perfection in weight, feel, and sound. Extensive Hammering: Gives these cymbals a dialed-in sonic response throughout all dynamic ranges. Brilliant Finish: Invented by Zildjian, the striking brilliant finish helps open up the sound, providing a bright and shimmery tone. Kit Includes: ChromaCast Cymbal Cleaner, cup washer, 2 felts, sleeve, & GoDpsMusic Polish Cloth