If you’re looking for something a little different these square section 925 Sterling Silver Hoops (sleepers) are it!  

It maybe hard to see from the picture but imagine you cut them open, these have a square not round profile. 

Square Section. Perceived Gauge 1.6mm. Internal Diameter at middle point 7.5mm

Square Section. Perceived Gauge 1.6mm. Internal Diameter at middle point 9mm.