The No.8 is 57mm,suitable for people with 55-65 kg
The No.9 is 61mm,suitable for people with 65-72.5 kg
The No.10 is 64mm,suitable for people with 72.5-80 kg
The No.11 is 68mm,suitable for people with 80-90 kg
Material: Stainless steel
Size: inner diameter of about 22mm
Color: black, gold, silver
Package Included:
1*Stainless steel ring opener