They are too tight. In the first picture, you can see the gold stripe on the little finger of a size 5 adult. Notice that the tip is beginning to discolor (become whiter). In the second photo, the index finger of a super-thin 10-year-old boy with the same golden one. The third and fourth are gold on his little finger. Too tight even for him. I stretched the green (carefully and slowly) and was able to find the perfect size for it. You can see it didn't last long (green/gold side by side) but it's VERY easy to stretch (silver/gold) and once they stretch they never come back. They are advertised specifically for youth and adults. However, if they don't even fit the fingers of a very skinny 10 year old or an adult pinky with a ring size 5, I don't know what teen/adult they will fit. I would definitely only say "teen/adult" if that teen/adult doesn't like tugging (in which case use something like a rubber band). I was really hoping it would be great but now that we have it I'm disappointed. They lose their shape too easily. I'm also concerned about how to properly clean them given the structure. 2 stars because you get what you pay for for the price and quantity.
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