The ELONG nip-suckers actually work and are very nice. They are slightly curved but not conical – they can suction any nipple size and are deep and large enough for small to medium holes. These suckers stay in place, with their base expanding for more contact with the skin, sealing even in smaller or larger sizes – even on furry breasts. They are made from hard flexTPR, the strongest and most flexible rubber. What gives this powerful suction are the four elastic rings that allow the nipple tube to open without collapsing, like the old snakebite-type suckers – the walls have been made thinner to allow for more pumping and even larger nipples to be sucked.