I have what I think is a normal adult-woman sized head. I like that this item includes variety and the beads certainly show beautifully. 5mm or when using 2. Please make loose fit again, Nike! I didnt want to spend a ton of money not knowing if I would like the style, etc, so for the price, Id say these are worth it, depending on what you want them to do. This wasn’t a true problem for me as we had one that fit. Mounted two mountain bikes and it holds very well. I have a wide foot and these house shoes have plenty of room in the toe box. I emailed Haizhuan and they replied quickly and sent a new headset within a few days. I am an Offa wearer and have been for a few years.