These are a pair of brand new replacement headphone foams. The diameter of the foam is 1.5" and the height is 0.5". They are intended for use with these retro foam headphones.
They have a bit of stretch, so they may fit other models that use similarly sized foam. It such cases, remove the existing foam pads from your headphones and measure them to to confirm the sizes match before ordering.
These foam replacements do not fit any of the Koss headphones we offer.