Thank you for reading and for the question! Unfortunately, a friend of mine has my pair right now or I’d measure them straight away. Sadly, I feel like they’re going to be just a touch small for you. But I wouldn’t comment for sure without measuring.
Plantronics’ support department is very responsive, and I’m sure they could quickly provide you with specs that are more accurate than measurements of my slightly stretched-out cups would be! You can find them on Twitter at “@PLTGaming,” or through their web site. I’ve just had a chat with them over twitter this morning and they’re very nice people in general!
Sorry I can’t help you out more. Thanks again for stopping by.