Glass dildos have similar features to steel ones. In most of the cases, glass toys are solid, and made of Pyrex or other types borosilicate glass (Schott-Duranglas and Simax), although this may vary, depending on the manufacturer. Like steel, glass toys may be used to apply firmer pressure than silicone can to a female's G-spot (urethral sponge) or male's prostate gland. Unlike other types of toys, glass sex toys can also be personalized with inscriptions and one of the cleanest dildo because of it's non-porous attribute.