This is one top cymbal from a ROCK HIHAT. Weighs 1245g on a household scale. Likely a 2011 model with an AA serial number. Two noticeable dents on the edge (photos 9 and 10). The area in photo 10 had suspicious dents upon acquisition, and to prevent cracking, I've examined it under a microscope and removed any hairline cracks. Regarding my repairs: If cracks are stopped only with drill holes, the cracked surfaces can still make contact, causing buzzing noises and negatively affecting sustain and tone. This often leads to the cymbal sounding bad and being easily damaged by hard hits. For practical use, cutting the cymbal is often the best approach. During processing, I use a scope to ensure I remove even the roots of cracks that are invisible to the naked eye, preventing recurrence. The processed surfaces are smoothed and polished. A final sound check is performed to ensure no overlooked or hidden cracks are present. Please feel free to ask if you have any other questions about the condition. Thank you for looking.