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Best For:
- Experienced users exploring urethral stimulation
- Electrostimulation enthusiasts seeking internal sensation
- Advanced BDSM play with precise control
- Partners experimenting with temperature play
- Those who prioritize medical-grade materials
The Mystim Slim Finn is a urethral sound designed for electrostimulation — a slim, bipolar dilator that delivers e-stim current directly to the urethra for an intensely focused sensation. At 6mm diameter and 15cm length, it's engineered for gradual insertion with a gently rounded tip and seamless pole transition. This isn't a beginner toy: it requires prior experience with urethral play, sterile technique, and a compatible e-stim unit (Mystim's Tension Lover, Cluster Buster, or Pure Vibes). The reward is a sensation profile impossible to achieve externally — pulsing, tingling, or throbbing from the inside, layered over the stretch of the sound itself.
Mystim hand-polishes each Slim Finn from medical-grade aluminum, making it non-porous, autoclavable, and temperature-responsive. Warm it on a radiator or chill it in the fridge before insertion to add thermal contrast to the e-stim rhythm. The bipolar design activates once the insulated section is past the urethral opening, isolating current between the two conductive zones. You control intensity through your stimulation device — gentle tickle to edge-of-orgasm pulse, sustained tease or rapid climax. Sessions can last minutes or hours depending on tolerance and program settings. This is not a plug-and-forget toy: it demands attention, preparation, and respect for anatomy.
Common hesitation: "Is urethral play safe?" Yes, when done correctly — sterile lube (never silicone-based for sounds), thorough cleaning before and after, slow insertion, and stopping at any resistance. The Slim Finn's smooth finish and rounded tip minimize friction, but user technique is the determining safety factor. This is advanced play; if you're new to sounding, start with non-conductive sounds to build familiarity before adding e-stim.
Key Features
- 6mm diameter, 15cm insertable length — designed for gradual urethral insertion
- Bipolar e-stim zones with seamless insulation transition
- Hand-polished medical-grade aluminum — autoclavable, non-porous, body-safe
- Gently rounded tip for smooth entry with proper lubrication
- Temperature-responsive: can be warmed or cooled before use
- Requires Mystim e-stim unit (Roundplug connection) — sold separately
- Weighs 15g — lightweight for extended wear during sessions
How to Use
Sterilize the Slim Finn and wash hands thoroughly. Apply generous sterile, water-based lubricant to the sound and urethral opening. Insert slowly, stopping at any resistance — never force. Once the insulated section is past the meatus, connect to your Mystim e-stim device via the Roundplug adapter. Start at the lowest intensity setting and increase gradually. After use, disconnect, remove slowly, and clean with antibacterial toy cleaner or autoclave. Never share sounds between partners without sterilization.
Compatibility
- Lubricant: Sterile, water-based only — never use silicone-based lube with urethral sounds.
- E-stim devices: Requires Mystim Tension Lover, Cluster Buster, Pure Vibes, or similar unit with Roundplug connection.
- Material compatibility: Aluminum is conductive and non-reactive — safe with water-based lubes and standard toy cleaners.
Frequently Asked Questions
What is the Mystim Slim Finn made of? The Slim Finn is crafted from medical-grade aluminum, hand-polished smooth for safe urethral insertion. It's non-porous, autoclavable, and hypoallergenic.
Do I need a separate device to use the Slim Finn? Yes — the Slim Finn requires a Mystim e-stim unit (Tension Lover, Cluster Buster, or Pure Vibes) to activate the bipolar stimulation. It connects via the Mystim Roundplug adapter.
Is the Slim Finn beginner-friendly for urethral play? No — this is an advanced toy for users experienced with urethral sounding and sterile technique. Start with non-conductive sounds if you're new to the practice.
What lubricant works with the Slim Finn? Use only sterile, water-based lubricant designed for urethral play. Never use silicone-based or oil-based lubes with sounds.
Does the Mystim Slim Finn ship discreetly to Canada? Yes — every order ships in plain, unmarked packaging with confidential billing.