Onna glass toys are perfectly smooth and non-porous. Glass toys can be used with any type of lubricant. We advise you to thoroughly clean and dry the toys before and after use and to use a condom if needed. each stone is unique, and there isn’t another like yours. All our products are handmade and may vary in patterns, hues, and colours. Our prices reflect our top quality & product authenticity. https://www.onnalifestyle.com/collections/glass-toys