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This threaded silicone Urethral Sound Set from Kiotos X is perfect if you want to practice stretching your urethra. Specially designed urethral sounds for your penis. Urethral probes are a strange but undeniably satisfying act for most people, which is why urethral probes are becoming increasingly popular. This set contains 3 threaded silicone urethral probes, starting with 6mm, then 8mm and finally 12mm diameter. These silicone sounds are free from toxins and will make you smile. Easy to clean. Toy cleaner recommended.