GreencoSet of 5 Unbreakable Reusable Plastic Kids Cups, Assorted Colors, 5 oz.

I'm wanting to use these in the bathroom for my kids to get a drink and also store their toothbrush. Are the cups heavy enough to not fall over?

Do you have stainless steel or aluminum cups the same size? hopefully also made in the usa!

Tell me if this product is safe?

Are there any neutral colors available or even a set with all the same colors? i like to avoid the dumb "i want the blue cup, not the red cup" fights.