The Sabian HHX Compression Hats are a combination of an un-lathed, aggressively hammered medium weight top, with 5 one-inch air holes. The bottom is fully lathed and heavy, with our Aero hole design. The holes in both the top and bottom result in a loud foot chick, with a trashy slap effect. Overall, the sound has a metallic/industrial type attack, and a trashy sizzle effect when played slightly open. Definitely a progressive sounding pair of hi hats.