This kind of ear pads are replacement for  AKG K271 K171 K240, AKG K241 K242 K272 AKG K550 K551,KOSS UR20; Audio-Technica ATH A500 A500X A700 A900 A950LP ATH AD1000X AD2000X AD900X AD700X; AKG K701 K702 Q701 Q702 K601;AKG K550 K551 K553. Features: Donut style design allows maximum sound to the ear from speaker. Function: replace your lost or worn-out ear pad cushions with a new pair. Easy to installation, better quality. Designed to enhance the fidelity of your audio by cushioning the vibrations between your ear and the headset, providing more vibrant sounds. This Earpads comes with PU Leather for extra comfort and upgraded memory foam for noise blocking enhancement. Specification: Item Type: Ear pads Material: PU Leather and Soft Foam Colour: Black, White(Optional) Quantity: a pair Item size:10.5*10.5*2 cm / 4.13*4.13*0.79 in(L * W * H) Package size:11*11*5 cm / 4.33*4.33*1.97 in(L * W * H) Package weight:30g /1.06oz NOTE: Before choosing the size, please increase the installation size of 2-3mm (for example, if your headphone size is 60-62mm, please select 65mm earmuffs) Packing list: 2 * Earphone Cover