diff --git a/gwinc/ifo/CE1/ifo.yaml b/gwinc/ifo/CE1/ifo.yaml
index 7cb6aed774f1c669c9faad85f5765b387abf4575..fb78bef775193990018354c53249e979704ed1d0 100644
--- a/gwinc/ifo/CE1/ifo.yaml
+++ b/gwinc/ifo/CE1/ifo.yaml
@@ -200,8 +200,8 @@ Suspension:
 
 ## Optic Material -------------------------------------------------------
 Materials:
-  MassRadius: 0.17                # m; 
-  MassThickness: 0.200            # m; Peter F 8/11/2005
+  MassRadius: 0.4                 # m
+  MassThickness: 0.286            # m
 
   ## Dielectric coating material parameters----------------------------------
   Coating: