Seven Creations Duo Balls - Soft Plastic Ben Wa Balls

These Ben wa balls are pretty cool and super cheap but I'm not comfortable using them a second time as the string between the balls is actual string which even with a coating of toy cleaner, I wouldn't trust hygiene wise..

These are pretty good as you can slip them in and then almost forget about them. They are also good for using if you want to feel full while having a little me time and don't want to have to wary about having something fall out.