This kind of ear pads are replacement for  KOSS Porta Pro PP Headphone KOSS KSC35, KSC75, KSC55, KSC50, KSC-10, KTX PRO1, KTX8, PTX6, KSC-11 KSC17, KSC7, KSC-12, CX6, KTX16, SA and UR5. 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:5*5*2 cm / 1.97*1.97*0.79 in(L * W * H) Package size:6*6*5 cm / 2.36*2.36*1.97 in(L * W * H) Package weight:25g /0.88oz 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