B20 Bronze Alloy Hand hammered for an unique sound Tradition and individuality The Meinl 15” Polyphonic Hihats are expressive through their varying profile with thin edges and a thicker, unlathed bell. Their medium thin weight in the bow allows them to be very versatile and live up to their Polyphonic name. When closed, these hihats deliver tight grooves with just the right balance of attack and air underneath. When you need power, open them up to hear the unlathed bell add a dark roar to the wash. The bell also provides the foundation for a solid chick with your foot.