They're easy to work with, they're made from paper but don't tear easily. The glue is fairly strong so if you use them over an older mani be careful not to press them too hard on your nail otherwise they can pull off the polish beneath.
Here are two manis made with BPS nail guide stickers.
Born pretty Store Color Changing Nail Polish 103 3 coats + Essence Deep Blue See + Tevez 09
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