A ball stretcher is a sex toy that is fastened around a man in order to elongate the scrotum and provide a feeling of weight pulling the testicles away from the body.
This ball stretcher separates so it can be closed around the balls, instead of having to pull the balls through the opening.
The smaller opening also means that most men will not be able to remove the stretcher without opening it. And it is much less likely to "pop" off.
* Ball Stretcher, 1,3 cm tall, 140 Gramm, Ø 35 mm