This solid hollow extension strap on makes for a great sex toy for couples as it can be used during intercourse, where not only will the added length and girth stimulate your partner but your erection will be supported by the solid penis dong. A comfortable synthetic leather harness with elastic straps holds the 6.5"(17cms) dildo in place. Firm but flexible is how we describe this type of hollow extension, firm enough to hold it's shape, but flexible enough to move under pressure, just like a solid erection!