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Metric reeds sold by Louët are specified as dents per 10 cm.
- • 40-10 means 40 dents in 10 cm.
 - • 1 inch = 2.54 cm.
 - • Therefore, 10 cm = 3.937 inches.
 
Conversion:
- Take the first number in the reed size (for example: in 50-10, use 50; in 60-10, use 60).
 - Divide this number by 3.937.
 
So, a 50-10 reed equals 12.7 dents per inch.
Using this in imperial calculations:
If you need 12 dents per inch, you could, for example, skip a dent about every other inch.