When Gracie Ruth was younger I used these metal clips that I found at an earring boutique. They worked great and I didn't have to fight a puppy to sit still while putting them in. You just bend them a little and they pop open.
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It was an easy transistion once she got enough hair to the grooming bands, but for every day wear I use the tiny scrunchies.
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Again, found at the earring boutiques, Target, Walmart, Dollar Store and some grocery stores.