Theo Wanne Pressure Plate Set 4pc, includes: Vintified: warm and dark tone with wonderful color, overtones, and core to the sound, Titanium: big, bold, open, free and fully alive sound with tons of character. Titanium has extremely resonant qualities which produce a lot of overtones, Stainless Steel: Vibrant and alive industrial sound. The heavy metal tone! Solid Silver: smooth, warm, round, and very pretty tone. It creates an elegant, more weighted sound with lots of core, life and beauty. All pressure plates fit all Theo Wanne mouthpieces.