The adaptor is of very high quality and I was quite surprised considering the low cost.
I was extremely disappointed that such a small item came in such a large box with lots of plastic wrap. What a waist! Surely a small padded envelope would have sufficed.
Not a good look for Sennheiser on the environment front.
It's a great quality 3.5mm male to 6.3mm female adapter. It's short and nicely made, providing good solid connection.