diff --git a/materials.py b/materials.py
index af62042..9f9abf6 100644
--- a/materials.py
+++ b/materials.py
@@ -1,9 +1,9 @@
 m_empty = {'E': 1.0E-20, 'NU': 0.0}
-#m_matrix = {'E': 29e2, 'NU': 0.4} # Carbon
-#m_fibers = {'E': 28e4, 'NU': 0.2} # Carbon
+m_matrix = {'E': 29e2, 'NU': 0.4} # Carbon
+m_fibers = {'E': 28e4, 'NU': 0.2} # Carbon
 
 #m_matrix = {'E': 400, 'NU': 0.05} # Carbon
 #m_fibers = {'E': 2e5, 'NU': 0.25} # Steel
 
-m_matrix = {'E': 750, 'NU': 0.17} # Carbon
-m_fibers = {'E': 2e5, 'NU': 0.25} # Steel
\ No newline at end of file
+#m_matrix = {'E': 750, 'NU': 0.17} # Carbon
+#m_fibers = {'E': 2e5, 'NU': 0.25} # Steel
\ No newline at end of file