1. Compatibility – These ear pads are designed for full-size headphones and are confirmed to fit AHD2000, AHD5000, AHD7000, AHD5200, AHD7200, and AHD9200 headphone models. The skirting attachment system on the back of the ear pads may also make them compatible with other headphone models. The listed models are those that have been tested. 2. Revive Your Headphones – If you own AHD2000, AHD5000, AHD7000, AHD5200, AHD7200, or AHD9200 headphones, these upgraded ear pads are designed to enhance comfort and sound quality, helping maintain the audio experience you expect. 3. Design and Quality – Premium sheepskin leather is used on the top and inner surfaces of the ear pads, which contact the skin. Protein PU material is used on the sides to improve seal and durability. Sheepskin is naturally porous, but combining it with protein PU on the sides helps optimize sound performance. Outer Dimensions: Diameter: 4 inches (10 cm), Ear cavity: 2.25 inches (6 cm) x 1.5 inches (4 cm), Thick angled side: 1 inch (2.5 cm), Thin angled side: 0.8 inches (2 cm). 4. Easy Installation – Detailed instructions and a video guide are included with the product to assist with installation. A video guide for Denon AH-D5200, AH-D7200, and AH-D9200 ear pad replacement is available on YouTube by searching 'AHG Denon AHD5200/7200/9200 ear pad installation'. For AHD2000, AHD5000, and AHD7000 models, search 'AHG Omni/Orion ear pad installation - Fostex/Denon etc'.