Great

The best way to use this toy is before you go out for a date night. You just put them in, or make your partner put them in. She has to keep them in using her muscles. This product is best suited for couples, and vaginal use. Make sure that you don't use them anally.

The material is a nice and hard metal. They are smooth, and very firm. The material is good for beginners or advanced. They are just metal balls; there's not much else to say about the material.

The design is good; they're perfectly round. They works just how they are supposed to work. The size is nice for anyone, and they're very discreet. Once your muscles are strong enough, you can have them in all the time, and no one will know.

From what I can tell, there are no comfort issues. They also do not make sound, and they're easy to use. They don't take batteries or recharge, but there is a fun way to make them vibrate.

These are super easy to take care of; you just clean them when you're done using them. They're easy to clean and store. We store ours in a small bag.

They're also super easy to use with lubricant.

When I put these in my partner, I love to have her on her belly. I slide my finger in between the 2 balls rapidly, causing them to clink together and vibrate against her G-spot. It drives her crazy.