CURB CHAIN NECKLACE - AFrom Good Art: Numbers and letters for sizes can be confusing. Usually the first size I make is the one I want to use, and it becomes the baseline or A size. After that I decide if I'll make other sizes. The first is usually the A or 1. So the letters or numbers going up are bigger sizes like B, C 2, 3 etc. This one is the A size and about it's about 7. 5mm wide. This chain is finished as always with the Model 9 clasp, a sculpture of impress function