
I have several other blender bottles that have a silver ball inside to help with blending. I shake the crap out of them all the time and they all hold up very well. This one does not have a silver bullet and the plastic is significantly cheaper/less durable. I used it to mix crystal light with water and ice, it had no metal or anything solid in it. Just shaking it with ice made the plastic inside start to peel off and small gray bits floated in my drink. I noticed this after about 3 months of use but don't know when it started.

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