X 5pcs japan food grade active silicone, pass sgs safety test - thumb shaped pacifiers fit with baby lips - free of endocrine disrupting chemicals (environmental hormon, bisphenol a) - repetition of suction, chewing, squeezing, swallowing, etc., and learning to suck babies - arc-shaped and two-side vents designed to prevent nose breathing - mobile pull ring baby easy to catch - transparent cleaning cover, dust-proof antifouling, sanitary see X material: pacifier~silicone < heat resistant 120 degrees > x Block, pacifier cover~polypropylene < heat resistant 100 degrees > Pull ring~tritan < heat resistant 100 degrees >