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There's literally hundreds on Amazon for under $10 for a pack of 3-4 usually. I like the ones that have the install tray that you place over your phone and it applies the protector. It's a no-brainer easy install.
 
yeah it's a plastic film and they have screen protectors separately for every phone, so probably they are custom designed to fit the respective phone. my screen protector is nearly 6 months old, apparently there's no bubbles and no yellowing
 
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