Zildjian GBI - FX Spiral stackers are cymbal stackers that allow you to create your own unique sounds and colours. Simply stack one on top of any cymbal (same size or larger)
Zildjian FX Spiral Stacker 12
Red Cymbals Custom Koru Spiral fx Crash Cymbal 14" - 20" - 'made to or
Zildjian FX FXSPL18 18" Spiral Trash Cymbal | Percussion Source