diff --git a/materials.txt b/materials.txt
index aa0bcb5..329e47e 100644
--- a/materials.txt
+++ b/materials.txt
@@ -1,15 +1,15 @@
 Window:
-Perspex Opal 040 (3.5 mm?) or Opal Silk 040 (3.0 mm)
-Thickness: 4.0 mm
-
-Supplier:
-WSV kunststoffen BV
+Material: Perspex Opal (light emissivity: 28%)
+Thickness: 3.0 mm
+Supplier: https://kunststofplatenshop.nl/product/plexiglas-opaalwit-3mm/
 
 M3 inserts:
-insert outer diameter: 5.0 mm
-length: 6.0 mm
+Insert outer diameter: 4.9 mm
+Length: 6.0 mm
+Supplier: https://www.123-3d.nl/123-3D-Schroefdraadbus-M3-10-stuks-i1687-t9745.html
 
 M3 screw:
-head diameter: 6.0 mm
-conus: 45 degrees 
+Head diameter: 6.0 mm
+Conus: 45 degrees
+Supplier: https://www.123-3d.nl/123-3D-Metaalschroef-verzonken-kop-M3x6-verzinkt-50-stuks-i1260-t3135.html