3.5 inches in diameter?? providing a massive amount of sheer and grip</br>it's ideal for areas like the QL?? pecs?? buttocks?? hips and other large muscle mass</br>use it against the wall and roll along the chest?? shoulders and scapula?? or go deep into your QL?? low back and hips</br>its soft top layer and dense inner core allows you to roll over and around bony prominences</br></br>Product Description</br></br>SOLD BY AN AUTHORIZED DEALER</br><br/>http://www.amazon.com/gp/product/B00NP280XY