Size Measurement X Small 3.5 (Pinky Size) 14.4mm in diameter Small – 5.5 16.2mm in diameter Medium – 7 17.3mm in diameter Large – 8.5 (Men’s Small) . 18.6mm in diameter X Large – 10 (Men’s Medium) 19.8mm in diameter XX Large – 11 ( Men’s Large) 20.7mm in diameter Please email us: [email protected] if you need any help with sizes.