A very useful item, if you like self bondage:
Fill stainless steel ice lock with water, freeze it, and then you can integrate it in your bondage play.
Dont't forget to test it before you start, so you will get an idea about the time,it locks... and don't forget a towel.
The ice lock is available in two sizes:
The small one (S) is approx. 15 cm long, diameter is 5 cm
the large One (L) is approx. 22 cm long, diameter is 5 cm.