They are round. The metal is 1” wide. one exhaust ring complete with hardware.  Choose your desired inner diameter from the drop down menu, be sure to figure out how much of a gap you need. Example 3" pipe 3.50" ring will give you a 1/4" of clearance. Sold one each. Matte finish. 

Hardware includes 8 stainless steel allen button head screws with nylock nuts and washers.

Please contact [email protected] with questions.