Indeed the Kali's teeth has always intrigued (and scared) me. I have to find one with adjustable teeths to start gradually also because being a grower, lenght and diameter of my cock increases a lot during erection so I have to be careful, because if I adjust the teeths so that the Kali stays at its place when flaccid, when I start hardening there is the risk of serious injuries because the diameter of my penis rapidly doubles so i should find something that stays on. Probably a cage with a base ring and adjustable spikes in the shaft would be more suitable, although the Kali that leaves the glans completely free to be stimulated by my companion when she is in the mood of torturing me bound to the rack is quite "interesting"