Add your own dong. Strap on harness fits any dong. Also compatible with all Nasstoys All American Whoppers and Lifelikes Dongs. Adjustable straps for a custom fit. Two ring sizes included - 2in and 2.5in. Material: Harness Polyurethane PU, Rings Metal. Phthalate free, non-toxic materials. Strap on only no dongs or attachments included.