Our new Duet is an amazing creation in glass. The woman uses her kegel muscles to simply hold the sex toy in her vagina while she penetrates her partner without a harness. Making the sexual play less constrained to a harness, and has the ability of pleasing herself at the very same time. The incentive of this toy is wonderful for strengthening her vagina muscles. The Duet's dimensions are 7 inches in length and 1.5 inches at the widest point. This product shows the creativity that RubyGlass21 is striving to achieve. Each RubyGlass21 toy is made from the highest quality Pyrex glass; which is the only type of glass that had been proven to be safe to use internally. Every piece goes under quality control testing to prove that we are the top rated glass sex toy manufacturer in the world. Made only in the USA.