The phrase "inch circumference" means the distance around an object. It refers to the measurement taken around the outer edge or perimeter of something, and it is expressed in inches. Full definition
(If you want to check my math... 29 inch circumference divided by 24 servings = 1.208 or about 1-1/5 inches per each of 24 servings.) (mariamindbodyhealth.com)
The cushioned grip has a 4.25 - inch circumference often cited as the universal grip size that anyone can use. (geekwrapped.com)
Roll each square out to increase the size by about 1/2 inch circumference. (grumpyshoneybunch.com)