Bosmarlin Glossy Ceramic Coffee Mug, Tea Cup for Office and Home, 18 oz, Dishwasher and Microwave Safe, 1 Pack (Purple)

Where are these made?

Does the glossy finish make this one more durable than the matte finish version?

I bought this mug to put vinyl on it and a few weeks later the vinyl is coming off and there is a coating peeling from the mug. Is this normal?

It says 1 pack in your description. How many are in a pack?