Hoop is measured in outer diameter and comes with a secure and flush connection using a poly carb insert.
You can find all grip tape options in my add on section.(link below) I highly recommend adding either the 3mm for on body hooping. It is also great for doubles. It will help the hoop "stick" to your body!
3mm grip tape:https://www.etsy.com/DivineHoopDance/listing/601821181/3mm-grip-tape-add-on?utm_source=Copy&utm_medium=ListingManager&utm_campaign=Share&utm_term=so.lmsm&share_time=1590027643527
gaffer grip tape:https://www.etsy.com/DivineHoopDance/listing/587372615/gaffer-grip-tape-add-on-only?utm_source=Copy&utm_medium=ListingManager&utm_campaign=Share&utm_term=so.lmsm&share_time=1590027766307
All of my hoops are crafted with careful thought and attention to detail. Please feel free to message me with any questions! I'd love to help create your dream hoop :)