https://www.shapeways.com/product/B2PRRDJNX/the-cherry-keeper-unicorn?optionId=70116263&li=shops It's an add-on to the Cherry Keeper that allows the mounting of a vac-u-lock or cock lock dildo to the top/front of the wearers chastity cage. Think of it like wearing a strapon over the chastity cage, but without the harness.