OXBALLS new RIBNIPS curved springyNIGHT EDITIONnipsucks in our lushest SILSOFT SILICONE blend, in deep dark velvet-black colora grippy super-stretchy rubber for the hardest, darkest-night play. RIBNIPS 2-pack nipsuckers are slightly curved but not tapered for a full thick sucked nip, with a flange base, these suckers stay on, the base flares out for more skin contact. The powerful suction comes four springy rings around each sucker that make the nipple-tube spring open, these will not collapse like old snakebite style suckers--we made the walls thinner to allow for more plump-pump and larger juicier sucked-onnips. To apply, simply wet the bottom of each sucker with spit, water-base lube lube, press against nips and squeeze the air out and slowly release. For extra vacuum suction, we recommend greasing the opening of each sucker with old school waxy ChapStick, it makes these suckers stick and forms an even better seal to your nips. NIGHT EDITIONs plush silicone-blend rubber is Phthalate free with no scent and has amazing super-strong stretch. SILSOFT is LUBE SAFE, we recommend water-based lube like our premium thick OXLUBE, hybrid easy-cleanup OXLUBE or our super-concentrated silicone OXLUBE. Oil-based lubes not recommended. CARE: Wash all toys after use in warm soapy water, air dry, (they will last longer). Store toys separately: we recommend storing in breathable cloth pouches, or for larger toys store in clean cotton socks.