diff --git a/Appendix-C:-Hardware.md b/Appendix-C:-Hardware.md
index 0284344..7a39370 100644
--- a/Appendix-C:-Hardware.md
+++ b/Appendix-C:-Hardware.md
@@ -77,4 +77,4 @@ Here are the critical specifications:
 
 ## Snooker ball
 
-We use 1.5-inch diameter (38.10mm) miniature snooker balls. Any ball between 47.60mm and 38.30mm will work.
\ No newline at end of file
+We use 1.5-inch diameter (38.10mm) miniature snooker balls. Any ball between 37.60mm and 38.30mm will work.
\ No newline at end of file