Vandoren V-12 Bb Clarinet Reeds #2.5, Box of 50

Thickness at the Tip: .10mm (0.004 inch) Thickness at the Heel: 3.15mm (0.124 inch, hence the name V-12) In comparing strength, a V-12 strength 4 reed is almost equal to a Traditional strength 3 1/2 strength reed.