5, but after reading the reviews, I decided to try a 9, and boy am I glad I did; they fit perfectly. I dont know how they could come up with this design but it just works. 00 for the H2s for the quality has dropped compared to my first few pair. The right side holes have bolts for a bracket you need to remove prior to installing the hitch. Then one day, a friend of mine let me try on a pair. Material opinion: As described - ehite leather - Good feel. The case is small and the sound is great. Idk? See how those go, maybe they will stay put. Theyre extremely lightweight to the point that it barely feels like youre wearing them at all. CON:Software headache: failed to update from new, wasted 2 hours unsuccessfully and wouldnt let me use the mouse without updating it, silly error(paranormal, see also photo, says to press update but no update button)Built quality: hmmm, personal opinion, feels cheap plastic, too light and cheap feel for my liking, NO GRIP AT ALL!