They're plastic so they won't break! Great for travel and outdoor use!
Shape:RoundQuantity:4Feature:Stocked,Eco-FriendlySpecification:
Material: PCTG (Tritan) Size: 11.5*8.2CM Product net weight: 37.2g*4 Product capacity: 16 ounces / 450ml / monthHeat resistance: 99°C-109°C