According to our information, these ear pads are replacement leather pads for the Plantronics Blackwire C5200 series. The exact dimensions are not specified.

I have no specific information about the diameter of the ear pads with the product ID "208927-01" from Poly. The information in my database does not contain details about the size of these ear pads. It would be helpful to contact Poly's official website or the manufacturer directly to find out the exact measurements.