1) beads are made with 100% silicone , eco-friendly, Bpa free (similar to pacifiers & nipples) 2) silicone bead necklace are soft on babies gums and emerging teeth 3) silicone bead necklace are easily cleaned with dish soap & water, Also dishwasher safe! 4) no bpa, pvc, phthalates, cadmium, or lead 5) silicone bead necklaces have a breakaway clasp for added safety 6) silicone bead necklaces are a great sensory tool to help your baby Focus while nursing 7) silicone bead necklaces are a colorful reminder of which side you've just nursed One/opp packing and 28-30pcs/pe packing and ctn size 46*28*35