These sleeves are designed by me to help with the problem of flimsy takeout cups getting crushed. In large groups there is no risk of grabbing the wrong cup, with your own sleeve that is reusable and customizable. They fit on Starbucks, McDonalds and most other takeout cups that I have tested. Solo/Dixie cups will be a bit loose depending on the style. These sleeves are 3D printed out of PETG and hand painted my me. Polyethylene terephthalate glycol, known as PETG or PET-G, is a thermoplastic polyester that delivers significant chemical resistance, durability, and formability for manufacturing. PETG is an adaptation of PET (Polyethylene terephthalate) where the ‘G’ stands for glycol, which is added at a molecular level to offer different chemical properties. PET uses the same monomers as the glycol modified PETG, but PETG has greater strength and durability, as well as being more impact resistant and better suited to higher temperatures.