A softer (in texture, at least!) option for particularly kink-minded playmates, the Master Series Dark Chamber helps keep a captive cock completely and comfortably under control. In temperature receptive silicone, the Cage traps your or their entire shaft in a super-smooth tamper proof tube with only the smallest tip opening.
Stretching very securely over a penis in question, the Dark Chamber features a thick, plushy silicone ring that loops under the balls while circling the shaft. That small opening we mentioned allows for urination and, since it contains no metal or hard bits, is safe(r) for travel and even airport security.
In body safe silicone, the Dark Chamber is easy to clean with warm soapy water or a good toy care fluid/foam, but it can also be boiled or bleached for more thorough sterilization. 
*The Dark Chamber is about 4"/10.2cm in length. The opening diameter is about 1.7"/4.3cm and stretches to fit most. The ball strap opening is about .8"/2cm un-stretched.