Double ended glass dildo. One is round simi for simple penetration and the other end has three penetrable circles for deeper penetration.
This material is completely non-toxic and withstands extreme temperatures and considerable shocks that do not compromise its structural integrity. They are completely safe. A properly manufactured glass toy withstands up to 1.3 kilos of extreme pressure, heat and cold.
Glass toys are non-porous and can be sterilized to prevent infection by sharing or lending them.