diff --git a/materials.py b/materials.py
index 2625b27..f181550 100644
--- a/materials.py
+++ b/materials.py
@@ -1,3 +1,3 @@
 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
\ 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