These silicone rings are very good for early learning of fine motor skills in young children. They are not very soft, which makes them comfortable when teething. They make a little beep when pressed (see attached video) and kids will love it. The size is a bit small and I think they could have included some other symbols instead of math symbols. Babies can associate birds and food symbols at such a young age, but nothing to do with addition and subtraction. My suggestion would be to add more images of animals and birds that kids see more often in videos and in the real world.
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