They are very thick and the adhesive is not very sticky. They were also transported (apparently from China) for ages and days. If you are looking for bike reflectors I would suggest using reflective stickers. Revain has an impressive collection of reflective bike stickers in a variety of shapes and colors. I ended up going with reflective orange peace sign decals after a two-year-old neighbor removed all of those reflectors from my daughter's bike. I wish I had even thought to look for them. I would save a few bucks.
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