Material and Cleaning
What makes these Crystal eggs so compelling is the material: 100% borosilicate (Pyrex) glass. It's completely body-safe; no cheap, friction-y, gaudy plastic here! Opaque black with white stripes, the jewel-like shine of glass gives the eggs an elegance reminiscent of something worn to a black and white ball. The imperfection of the stripes gives the eggs their handmade look. The shape is between egg and raindrop, because the small end comes to a smooth blunt point. Mine are 1 1/8 inches across, and 1 3/4 inches long.

Glass is compatible with all cleaning (soap and water, toy cleaner, rubbing alcohol) and sterilization methods (boiling water, 10% bleach solution, dishwasher if you have separate little plastic baskets for them so they don't hit anything rigid). Very convenient!

Glass can also be heated or cooled for temperature play, but because of their small size, these eggs will return to body temperature quickly.

Use
The tapered shape and the smoothness of glass make these very easy to insert. Glass is compatible with all lubes, but I found it unnecessary. The problem is, like a tampon, once they are in, you can't feel them! I tried walking, half-hearted jumping jacks, riding in a car; in general, they just aren't noticeable. I did notice them on a few rare occasions: a couple times when changing positions (sitting to standing) I did hear them clink audibly against each other, and once, when I ran and jumped, I felt their weight suddenly and shockingly.

Performance
The purpose of this toy is to aid in performing Kegel exercises. Kegel exercises are the squeezing and releasing of the pelvic floor muscles, done to increase bladder control, tighten the vagina, and maybe even intensify orgasm! Because I couldn't feel these glass eggs, at first I assumed that they weren't working my muscles at all. But when I peed, one of the eggs started to come out. If they come out when the pelvic floor muscles are relaxed (necessary to pee) then that means the muscles ARE working to hold them in against gravity the rest of the time. I wanted to test whether my muscles would tire, and the eggs would start to come out with long-term wear. But with both eggs in, after an hour or two I would get an uncomfortable pre-cramping feeling, probably due to the rigid glass poking around. So I wore one egg all day, about 10 hours, and it never started to slip out. So, the weight of one egg works my muscles so little that they don't tire after 10 hours! These don't replace remembering to consciously do your Kegel exercises!

Removal
I've read stories of Ben Wa balls getting “stuck”: once you are freaking out about not being able to remove them, the tension makes you involuntarily tighten your muscles, further holding them in! Not being a fan of fishing around in my vagina, I was nervous about whether they'd be difficult to remove. Turns out, all I had to do was stick a finger in to locate the egg, and then I found it very easy to push them out with my muscles.

If you are worried about removing them, just make sure you have access to a friend who you trust to fish them out for you. And if they do get stuck, don't worry. They can't go anywhere harmful, and they will come out eventually.

Packaging
These come with a black fabric pouch, but because it isn't padded, it won't offer much protection for the eggs - not a great storage method. They also come with a brochure explaining how to locate your pelvic floor muscles (insert a finger vaginally and squeeze on it), and preform Kegel exercises (a progression of sets of holding and releasing that muscle squeeze). It then has a diagram of the eggs being inserted into the vagina, and says to do the exercises once they are inserted. I find it amusing that they don't mention why doing the exercises with the eggs would be any better than doing them without!

I am new to the world of sex toys, and was intimidated by the idea of a vibrator. These seemed like a great alternative: a high-quality art piece that would be fun, and provide beneficial exercise. But after trying both these and the Lia Love Balls, I now want toys that actually DO something. I want toys I can feel! I am glad to have these in my collection for their beauty. And I will continue to explore Kegel exercisers: I want to try some vaginal balls with an internal, rumbly, free-moving weight I can actually FEEL. I may try some of the smaller Ben Wa balls (3/4 and 1/2 inch diameter) that are actually a challenge to hold in, and a wand is on my must-have list, because I've read they are far more efficient exercisers than balls. But mostly, I am ready for more sensation! It is time for me to move on to the world of vibrators.