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Add these Metal Nipple Bars to your torture toolkit and you may just never go back to using conventional clamps again. For advanced BDSM/nipple-device users only.This torture instrument consists of two long and thin (body-safe) metal bars, bound together tightly by rubber rings placed at opposite ends.The rings slide across the bar, further away from each other towards the black bar-ends, allowing the slit between the bars to slacken slightly, forming a wider gap, just enough to place the nipples between the bars.It will be a tight fit to begin with, but to ramp up the intensity slide the rings towards the nipples, placing tension on the bars that will force the gap to narrow, putting extra squeeze on those nipples that are now trapped between both bars.How narrow should the gap be? How tight should you go? That all depends on the wearer's pleasure/pain threshold.With the wearer's nipples at your mercy, play with the bar a little; flick it, tilt it, even use the small hook in the middle to hang light weights off it (stress on the 'light', for the health of both toy and nipples). During and after use the wearer's nipples will become more sensitive than usual, not a bad time to treat them to some tongue-loving.If you find fitting the nipples between the bars is troublesome, you might find applying a moistener like a nipple arousal cream or a lubricant provides you with much-needed slippery assistance. If you choose to use lubricant the great thing about metal toys is they are one of the few toy materials compatible with longer-lasting silicone-based lubricant.