diff --git a/04-material/PLA+/SUNLU/black.md b/04-material/PLA+/SUNLU/black.md
index 7b8989f..8ea34a5 100644
--- a/04-material/PLA+/SUNLU/black.md
+++ b/04-material/PLA+/SUNLU/black.md
@@ -7,9 +7,9 @@
 | Printing Temperature                           | 215°C    |
 | Build Plate Temperature                        | 65°C     |
 | Flow                                           | 93.5%    |
-| Retraction Distance                            | 0.55mm   | ?
+| Retraction Distance                            | 0.50mm   | ?
 | Retraction Speed                               | 50mm/s   | ?
-| Retraction Extra Prime Amount                  | 0.03mm   |
+| Retraction Extra Prime Amount                  | 0.02mm   |
 | Linear Advance Factor                          | 0.04     |
 
 ## Prices