Differentiating feature is the plugs are 24mm to 21mm narrow. I have tried flange screw connections several times, with and without nipple oil. For the first time I felt like sinking little hickeys into my nipples. The material is not optimal for smooth tissue movement and reduces the massage sensation of the new pump type (Spectra/Luna).1. Clear plugs do not fully penetrate the canal, leaving a small "piston" protruding towards the areola. (It fully slides in 28mm) 2. The material is "non-slip", after a few minutes of pumping, my skin started to stick to the silicone, creating strong/uncomfortable suction.3. Totally Transparent: The material is totally transparent, so it's hard to find at night. Nipple oil must be used with this material - it accurately reduces the size from 28mm to 21mm.
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