
The marker doesn't clean off as easily as I would like, and the lines eventually do start to wear off the sides. I also dropped one about 2 inches and it broke and shattered into little pieces all over. I know it's glass, but you would think something meant to be for babies would be a little more durable. I also wish the lines went further up the sides.They don't leak, and overall I like them better than the competitors I've tried; plus they're cheaper. Their Customer Service is exceptional if you do need to contact them.

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