diff --git a/Appendix-C:-Hardware.md b/Appendix-C:-Hardware.md
index e3e8bbc..08ce961 100644
--- a/Appendix-C:-Hardware.md
+++ b/Appendix-C:-Hardware.md
@@ -48,4 +48,4 @@ There aren't really critical specifications for this. Use whatever you've got on
 
 ## Snooker ball
 
-We use 1.5-inch diameter (38.10mm) miniature snooker balls. Any ball between 47.60mm and 38.30mm will work.
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+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