Rainbow Cup / Monzcare R-cup
Couldn’t find an official site for these, just being sold online at places like ebay and amazon. So details are a bit sketchy.
This cup is also being sold as a “Monzcare R-cup” and “Monzcup”. They are registered with the FDA under these names [Link].
Country of origin: China
Composition: Silicone
Sizes: “1″ (small), “2″ (large)
Dimensions: Size 1 = 40mm diameter, Total length 70mm, stem length 20mm. Size 2 = 45mm diameter, Total length 70mm, stem length 15mm.
Capacity: Size 1 = 15.5ml (to holes?) 20ml (to rim). Size 2 = 26mls (to rim?)
Stem: Hollow tube or Solid?
Measuring Lines: No
Cost (RRP): Unknown RRP – available from around $10US
Been around since: 2014?
Other Details: Available in blue, green, purple and orange. I don’t like that their advertising claims “The Rainbow’s Menstrual Cup is the original silicone menstrual cup designed by women to be a convenient, safe and eco-friendly alternative to tampons and sanitary pads. ” Since it isn’t the original silicone cup…. Mooncup UK was the first silicone cup in 2000. Some people have complained that these cups have a very strong “plastic” or chemical smell.
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About
A menstrual cup is form of reusable menstrual protection. It is inserted into the vagina to collect menstrual fluids. Once in place it forms a seal, preventing blood flowing out of the vagina by collecting it in its “cup” shaped reservoir. Unlike a tampon which absorbs the blood along with the vagina’s natural secretions, a menstrual cup simply holds the fluids until you remove it – so they do not dry out the vagina and do not hold the TSS risk that tampons do.
They hold around 20-30ml, which is for most women will cope with a full day without emptying, and at most perhaps you would need to empty it a few times a day for a very heavy flow. A menstrual cup will last (with proper care) for around 10 years, perhaps longer, so while the initial outlay is high, it pays for itself with savings pretty quick.
This is a sister site to www.clothpads.org. For information on cloth pads, please check that website.
This blog is a place to find information about the different cup brands I know about. All the brands I am aware of, are listed in the menu – Clicking on these brand-name links will take you to a page of information I have about them.
Menstrual Cups 
I have a large Rainbow and didn’t notice any smell at all. I love that it’s super soft and on the long side for my high cervix, and I find the slightly firmer rim and the grip rings helpful. I wish it were even a bit longer in the stem for my highest cervix days but overall, I’m a big fan. It’s just as well made as any other, much more pricey cup I’ve used. Unfortunately I don’t see them on Amazon anymore, but they’re still available on Ebay.
That’s the problem with cups like this that have no website, it’s just a case of checking ebay/Amazon regularly to see what’s available.