Can someone tell me how thick the rim of the glass is. The part where you put your mouth, how thick is it?

It's a nice sturdy glass without being too thick or thin. I use them everyday and put them through a full dishwasher and none have broken. The quality is very good and I would definitely buy again.

Are these tempered glass?

They are a nice every day glass! Don't think they are tempered glasses. They go great with a cobalt blue pattern set of dishes. Not can y ,but very useable!

Are these glass or plastic?

Great question! These tumblers are made of glass. Please reach out to us at customercare@libbey.com should you have any other questions about this product. -Ashley

Reusability	Reusable
Material Type Free	BPA Free
Product Care Instructions	Dishwasher Safe
Material Features	Recyclable
Material Type	Glass
Item Weight	0.3 Pounds
Number of Items	8
Item Dimensions W x H	3.5"W x 6.25"H
Unit Count	8.0 Count
Capacity	17.25 Fluid Ounces
Shape	Round
Pattern	Solid
Occasion	Evening
Color	Flare
Style Name	Modern
Additional Features	Color-infused Cobalt Tumbler Glasses

Libbey Cobalt Flare Drinking Glasses Set of 8, Classic Design Glass Cups for Soda, Water, Iced Tea and More, Dishwasher Safe Glass Cup Set for Beverages

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