Ruby Cup Classic comes in the sizes: Small and Medium. Choose Small when you have a light flow and Medium when you have a medium to heavy flow. Here are the Ruby Cup measurements.
Ruby Cup Small 
For lighter to medium periods
Cup length |
Stem length |
Total length |
Diameter |
Capacity to the rim |
Capacity to the holes |
46 mm |
19 mm |
65 mm |
40 mm |
24 ml |
19 ml |
Ruby Cup Medium 

For medium to heavy periods
Cup length |
Stem length |
Total length |
Diameter |
Capacity to the rim |
Capacity to the holes |
51 mm |
17 mm |
68 mm |
45 mm |
34 ml |
24 ml |