Doc Johnson Kink Leather Sub Presenter Black Red Cock Cage. When he’s tied up and ready to be tormented, strap your sub into Kink by Doc Johnson’s Leather Sub Presenter for enhanced hardness and sensitivity. This luxurious black and red leather cock cage lifts and presents the wearer’s package so he remembers what is yours, and keeps him hard for your pleasure as long as you choose. Specifications: color Black, Red. UPC Code 782421060145. Ring inner diameter 2.5 inches. Material Leather. Kink by Doc Johnson is an exciting collaboration with Kink.com to create a collection of high quality authentic fetish items suitable for long term practitioners and new initiates alike.