Satisfyer Crystal is a glass dildo, and specifically borosilicate glass, which is the laboratory grade rather than ordinary glassware. That matters for two reasons. It is non-porous, so nothing soaks into the surface and cleaning is genuinely complete rather than approximate, and it takes temperature well, so it can be warmed in water or chilled beforehand to add a sensation no motor can produce. The listing is a double-ended design, giving two different shapes on one piece. Glass is rigid, which suits precise pressure against a specific spot better than a flexible toy does. Any lubricant works with it, silicone gels included, because there is no surface to degrade. The dildo shelf holds the softer alternatives.
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