diff --git a/README.md b/README.md
index 306c91be72dcace9688929a8882b2cb26974aa53..10e9d8e2b52e805a8739f409d2d4b2211eb70391 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ Stereo:
 
 ## Refinements to first prototypes
 
-I did some more prototyping on this design, using milled 1/16" cotton-phenolic, instead of laser-cut 1/8" plywood.  I also cured the membrane onto a thin sheet of carbon with a 0,+60,-60 layup.  I also switched to 1/8" (D) x 1/16" (H) magnets, instead of 1/8" (D) x 1/8" (H), because the simulations predicted the force output would be similar.
+I did some more prototyping on this design, using milled 1/16" cotton-phenolic, instead of laser-cut 1/8" plywood.  I also cured the membrane onto a thin sheet of carbon with a 0,+60,-60 layup.  I also switched to 1/8" (D) x 1/16" (H) magnets, instead of 1/8" (D) x 1/8" (H), because the simulations predicted the force output would be similar.  The total stack is about 4mm thick. :)
 
 <img src= "img/phenolic-magnets.jpg" height=300px>
 <img src= "img/phenolic-carbon.jpg" height=300px>