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I have a phone case that is not flush but this ring holder works great and has a strong adhesive
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It lost adhesive after few days, tried to put it back on but one day it fell off and I lost it
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so I cannot say how well the adhesive will last over time, but initially, it is stuck on there securely
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The adhesive is very, very strong and this comes with duplicates (not sure why).
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My only issue is the adhesive was not very strong and it came off the first time, but they give you extras
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Plus it is very sturdy and the adhesive is strong
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The ring turns smoothly, and the adhesive is very sturdy
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Strong adhesive.