diff --git a/msgpi/sg/sg.py b/msgpi/sg/sg.py
index bc9f5e3..2db9c07 100644
--- a/msgpi/sg/sg.py
+++ b/msgpi/sg/sg.py
@@ -662,6 +662,9 @@ def __init__(self, name, sgdim, smdim=None):
         #: list of floats: Oblique (beam only)
         self.oblique = [1.0, 0.0]
 
+        #: list of floats: Lame parameters for geometrically corrected shell model
+        self.lame_params = [1.0, 1.0]
+
         #: dict of {int, :obj:`msgpi.sg.MaterialProperty`}: Materials
         self.materials = {}
 
@@ -1088,6 +1091,7 @@ def __writeInputSGHeader(self, fobj, sfi, sff, solver, sg_fmt):
                     #     self.initial_curvature[0], self.initial_curvature[1]
                     # ))
                     utio.writeFormatFloats(fobj, self.initial_curvature, sff)
+                    utio.writeFormatFloats(fobj, self.lame_params, sff)
                 fobj.write('\n')
 
             # Head