This cock ring set offers three different sized cock rings. Not sure what size you need or what might feel most comfortable? Then this is an inexpensive way to find out. Silicone has more give than other materials and tends to be comfortable.
This value priced set includes these sizes:
1.25 inch
1.5 inch
2 inch
This value priced set includes these sizes:
1.25 inch
1.5 inch
2 inch