Our lids are designed to fit all other name brand cups with 98 mm diameter. This lid fits Karat12-24 oz cups. Not for 12 oz cups with 92 mm diameter. Polyethylene terephalate (PET) is a thermoplastic resin of the polyester family, widely used in the production of food and beverage containers. PET's popularity originates from its high clarity and durability. These cold cups are not only freeze/heat resistant (-22° F to 180° F), but also crack resistant. Unlike other plastics, Karat® PET is recyclable. It's resin identification is 1. Use for a wide range of products such as iced tea, slushes, juice, ice cream, cold beer and more! 1000 per case.