Measure around knuckle (middle of finger) on index finger of bridge-hand to obtain your correct size. 

Use a cloth (soft) measuring tape. 
Place measuring tape around knuckle as if you were measuring for a ring size. 

If you don't have a cloth measuring tape, you can substitute a piece of string. 

1. Wrap string around knuckle and mark the string where it meets together. 

2. Lay the string out flat and use any ruler or tape measure handy.

3. Measure from the end of the string to the mark you made.

Choose your size according to circumference measurement.

Sizes:

Small: 1 5/8" to 2 1/8"