Important!
Measure in millimeters.
There are standard sizes as stated below. Although, it is recommended to select custom sizing for a snug fit.
Standard Sizes:
Extra Small (14mm,10mm,11mm,10mm,7mm)
Small (15mm,10mm,12mm,11mm,8mm)
Medium (15mm,11mm,13mm,12mm,8mm)
Large (16mm,12mm,14mm,13mm,9mm)